Onset Transition Temperature Research Articles

Synthesis and superconductivity of a novel quasi-one-dimensional ternary molybdenum pnictide Cs2Mo3As3

We report the synthesis and characterization of a new ternary molybdenum pnictide superconductor, Cs2Mo3As3. The powder x-ray diffraction analysis reveals the quasi-one-dimensional (Q1D) hexagonal crystal structure formed by Cs+ and infinite (Mo3As3)2− chains as indicated by the wire-like grain morphology. Electrical resistivity and magnetic susceptibility characterizations exhibit superconductivity with the onset transition temperature at 11.5 K, which is the highest in all Q1D superconductors reported so far. An upper critical magnetic field of about 61.7 T at zero temperature was extrapolated from the resistivity measurement under a magnetic field, which is much higher than the Pauli paramagnetic limit, and the reason for such a high upper critical field may lie in its unconventional nature of superconducting pairing symmetry. The discovery of Cs2Mo3As3 inspires the search for new superconductors for future high field applications.

Flux pinning and the vortex phase diagram in optimized CaKFe4As4 single crystals fabricated by a one-step method

We have synthesized CaKFe4As4 single crystals by a simple one-step method. X-ray analysis suggests that the single crystals are c-axis orientation and no obvious impurity phase can be detected. The onset transition temperature is about 35 K with the ΔTc ∼ 1 K. By measuring the magnetoreistance, the vortex liquid-to-glass transitions of the CaKFe4As4 single crystals have been investigated. The effective flux pinning potential U0(B, T) and well scaling of the resistivity (B, T) were achieved. The vortex phase diagrams have been established on the basic of vortex glass temperature Tg and upper critical field Hc2. We have compared the vortex glass phase diagram of CaKFe4As4 with Ba1−xKxFe2As2 single crystals, and found that both samples have narrow vortex liquid region. The analysis on flux pinning indicates that the flux pinning ability of CaKFe4As4 is very strong and only slightly smaller than Ba1−xKxFe2As2 single crystals. The dependence of flux pinning energies UB of CaKFe4As4 on magnetic induction is UB B−0.265 and B−0.177 for the H//c and H//ab, respectively. Taking the structural difference between CaKFe4As4 and Ba1−xKxFe2As2 into account, the origin of the flux pinning in CaKFe4As4 may have close relationship with itself electronic inhomogeneity and accompanying nanosized-intercalation of CaFe2As2 as well as distorted FeAs4-tetrahedrons.

Formation of Tl-1212 phase in Ga-substituted Tl(BaSr)Ca1−xGaxCu2O7 superconductor

The effect of Ga substitution on the superconductivity of Tl(BaSr)Ca1-xGaxCu2O7 (x = 0–0.5) is reported. The samples were prepared by solid-state reaction method. XRD patterns showed a single Tl-1212 phase for the x = 0 and 0.1 samples. Unreacted Ga2O3 and other impurity phases were observed in the higher substituted (x = 0.2 to 0.5) samples. The temperature-dependent resistance measurements showed metallic normal state behavior for all samples with onset transition temperature Tc-onset between 94 and 66 K and zero transition temperature Tc-zero between 86 and 55 K. AC susceptibility measurement showed the highest superconducting transition (95 K) and peak temperature (89 K) for non-substituted sample. The intergranular critical current density Jc at Tp for all samples was between 16 and 22 A cm−2. This work showed that the intergranular coupling and flux pinning energy were suppressed with Ga substitution. Some Ga+2 were most likely incorporated at Ca+2 for x = 0.1 and some resided at the grains for x ≥ 0.2 samples. This work showed that a single superconducting Tl-1212 phase was formed for x ≤ 0.1 samples. This work also showed that the internal lattice constrain which is the ratio of the lattice parameter (a/c) is important in improving the transition temperature of the Tl-1212 phase.

Sustainable Jatropha Oil-Based Membrane with Graphene Oxide for Potential Application in Cu(II) Ion Removal from Aqueous Solution

More recent attention has been focused on the utilization of Jatropha curcas in the field of water treatment. The potential of Jatropha oil in the synthesis of membrane for water filtration had been explored, its performance compared to the addition of graphene oxide (GO) in the polymer matrix. Jatropha oil was modified in a two-step method to produce Jatropha oil-based polyol (JOL) and was blended with hexamethylene diisocyanate (HDI) to produce Jatropha polyurethane membrane (JPU). JPU was synthesized in different conditions to obtain the optimized membrane and was blended with different GO loading to form Jatropha/graphene oxide composite membrane (JPU/GO) for performance improvement. The synthesized pristine JPU and JPU/GO were evaluated and the materials were analyzed using fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), contact angle, water flux, and field emission scanning electron microscopy (FESEM). Results showed that the ratio of HDI to JOL for optimized JPU was obtained at 5:5 (v/v) with the cross-linking temperature at 90 °C and curing temperature at 150 °C. As GO was added into JPU, several changes were observed. The glass transition temperature (Tg) and onset temperature (To) increased from 58 °C to 69 °C and from 170 °C to 202 °C, respectively. The contact angle, however, decreased from 88.8° to 52.1° while the water flux improved from 223.33 L/m2·h to 523.33 L/m2·h, and the pore distribution in JPU/GO became more orderly. Filtration of copper ions using the synthesized membrane was performed to give rejection percentages between 33.51% and 71.60%. The results indicated that GO had a significant impact on JPU. Taken together, these results have suggested that JPU/GO has the potential for use in water filtration.

Analysis of Physical and Structural Properties of Alkali Oxide–Modified Tellurite Glasses

Glasses in the system x M2O·(1 − x) TeO2 (0 ≤ x ≤ 0.25), where M = Li, Na, K, Rb, Cs, were made by melting in platinum crucibles. Various quenching methods were used to make each glass because some glasses require extremely rapid cooling. Physical properties such as the glass transition onset temperature (Tg) and density (ρ) were measured. In order to explore the short-range structure in these glasses, Raman spectroscopy, infrared spectroscopy, and high-energy x-ray diffraction were used. These experiments on tellurite glasses were performed to find correlations between the physical and structural properties.

Surface superconductivity in the type II Weyl semimetal TaIrTe4.

The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically non-trivial and host exotic Majorana modes. The layered material TaIrTe4 is a newly predicted time-reversal invariant type II Weyl semimetal with the minimum number of Weyl points. Here, we report the discovery of surface superconductivity in Weyl semimetal TaIrTe4. Our scanning tunneling microscopy/spectroscopy (STM/STS) visualizes Fermi arc surface states of TaIrTe4 that are consistent with the previous angle-resolved photoemission spectroscopy results. By a systematic study based on STS at ultralow temperature, we observe uniform superconducting gaps on the sample surface. The superconductivity is further confirmed by electrical transport measurements at ultralow temperature, with an onset transition temperature (Tc) up to 1.54 K being observed. The normalized upper critical field h*(T/Tc) behavior and the stability of the superconductivity against the ferromagnet indicate that the discovered superconductivity is unconventional with the p-wave pairing. The systematic STS, and thickness- and angular-dependent transport measurements reveal that the detected superconductivity is quasi-1D and occurs in the surface states. The discovery of the surface superconductivity in TaIrTe4 provides a new novel platform to explore topological superconductivity and Majorana modes.

Effects of Bi and Si substitutions on (Tl0.5Bi0.5-xSix)Sr2CaCu2O7 superconductor

The effects of Bi and Si substitutions on the superconducting properties of (T10.5Bi0.5-xSix)Sr2CaCu2O7 (Tl-1212) for x = 0 to 0.5 were studied. The samples were prepared by the solid-state reaction method. X-ray diffraction patterns showed that lower substitution (x ≤ 0.2) of Si did not affect the formation of Tl-1212 phase. The temperature-dependent electrical resistance measurements showed that the onset transition temperature, Tc-onset and zero transition temperature, Tc-zero for x = 0–0.4 samples was between 91 and 96 K, and 78 and 81 K, respectively. AC susceptibility measurements showed transition temperature, Tcχ’ between 82 and 90 K. The peak temperature, Tp of the imaginary part of the susceptibility, χ” shifted to higher temperatures for x = 0 to 0.3 indicating enhancement of flux pinning and intergranular coupling. Further substitution of Si (x = 0.5) destroyed superconductivity of the Tl-1212 phase demonstrating that although Si can fully substitute Bi at Tl site and form majority (60%) Tl-1212 phase, superconductivity was not achieved. This work showed that Si could act as flux pinning centers for Tl-1212 high-temperature superconductor for low-level substitutions.

Designed Synthesis and Structure–Property Relationships of Kinetically Stable [(PbSe)1+δ]m(VSe2)1 (m = 1, 2, 3, 4) Heterostructures

Understanding structure–function relationships is essential to guide the designed synthesis of novel materials with emergent properties. In this work, we targeted the metastable heterostructures [(PbSe)1+δ]m(VSe2)1, where m = 1–4, to test if the charge density wave (CDW) transition temperature increases as the layer thickness separating the VSe2 monolayers increases, as was observed when SnSe was the separating layer. The modulated elemental reactant approach was used to make the targeted products. This approach involves depositing elemental layers in which the number of atoms of each element per square angstrom in Pb|Se and V|Se bilayers equals the number calculated for a rock salt-structured PbSe bilayer and a CdI2-structured VSe2 slab, respectively. Layered elemental precursors with the correct composition and nanoarchitecture for each of the targeted compounds were prepared by repeatedly depositing a single V|Se bilayer followed by m Pb|Se bilayers. Precursors close to the targeted number of atoms per unit area were determined via X-ray fluorescence and the correct nanoarchitecture self-assembled to the targeted compounds during a low-temperature anneal. Resistivity measurements show that the number of PbSe layers per repeat unit (m) does not change the charge density transition onset temperature as previously reported for the analogous [(SnSe)1+δ]m(VSe2)1 compounds. The temperature dependence and absolute values of the resistivity of the m = 3 and 4 heterostructures scale as expected for composite behavior. The difference in the thickness dependence of the CDW transition between the PbSe- and SnSe-containing compounds highlights that the identity of the intervening rock salt layer plays a more important role in modifying the CDW onset temperature than the separation of the VSe2 layers.

Glass transition of LiCl aqueous solutions confined in mesoporous silica

The thermal transitions of confined LiCl aqueous solutions were studied by differential scanning calorimetry for solutions with salt concentrations with eutectic (R = 7) and subeutectic (R > 7) compositions (R = moles of water/moles of LiCl). The confinement media consist of mesoporous silica with pore diameters between 2 nm and 58 nm, with a small negative surface charge density. The vitrification of confined LiCl aqueous solutions was observed in all samples, expanding the vitrification region up to R = 15, and probably beyond for cooling rates of ≈1000 K/min. Ice crystallization was observed in some samples, except for those confined in the narrower pores. The onset and endpoint glass transition temperatures for the confined eutectic samples increase by 2 K and 5 K, respectively, for the smallest pore diameters (2 nm), which is equivalent to the effect of applying a pressure of up to 100 MPa to the bulk sample. This behavior is opposite of that reported for aqueous subeutectic NaCl solutions confined in silica glasses of similar sizes. We speculate that this is due to the fact that the mechanism of double confinement of the NaCl solution, between the pore wall and the precipitated ice, is not operative for LiCl solutions. Instead, the Li+ ions might force the hydration water in to a high-density state.

MD study on topologically close-packed and configuration entropy of Mg40Al60 metallic glasses under rapid solidification

Herein, the effects of cooling rate during rapid solidification of Mg40Al60 metallic glasses are studied using the molecular dynamics (MD) simulation. The system energy, pair distribution function (PDF), local structures, configuration entropy, and three-dimensional visualization are used to systematically analyze the evolution of microstructure with temperature. Results indicate that the lower the cooling rate, the lower the average atomic energy. With the decrease of cooling rate, increases the height difference between two splitting subpeaks of the second peak on PDF curves; while decreases the onset temperature of glass transition. The effect of the cooling rate on the topologically close-packed (TCP) clusters is similar to the local five-fold structures of S555: the lower the cooling rate, the more the amount of TCP clusters, and the lower the configuration entropy. In addition, most TCP clusters are centered the smaller Al atoms.

Effect of K Substitutions on Structural and Superconducting Properties in Bi1.6Pb0.4Sr2-xKxCa2Cu3O10+ Compounds

Abstract: Effect of K substitutions on structural and superconducting properties in Bi-Pb-Sr-Ca-Cu-O (BPSCCO) system has been investigated. Bulk Bi1.6Pb0.4Sr2-xKxCa2Cu3O10+d (where x = 0.00; 0.04; 0.08 and 0.1) samples were fabricated by using the solid-state reaction method. Structural properties of the samples were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) measurement. All samples showed co-existence of Bi-2223 and Bi-2212 superconducting phases. Interestingly, a formation of the Bi-2223 was decelerated and that of the Bi-2212 was accelerated with increasing K content (x). Superconducting properties of the samples were characterized by using temperature dependences of resistance and field dependences of magnetization data. Both onset and offset transition temperatures were found to decrease, those were correlated to the decreases in residual resistance ratio (RRR). The 65 K magnetization curves of K- substituted samples were enlarged in comparison with that of the pure one. Enlargements of the magnetization curves were possibly attributed to the appearance of additional point-like defects generated by substitutions of K into Sr site.
 Keywords: BPSCCO, substitutions, flux pinning, defects.

Investigation of superconducting and elastic parameters of YBCO/LSMO thick films

The variations of superconducting and mechanical properties of La0.67Sr0.33MnO3 (LSMO) [x = 0.0, 0.1, and 0.2] doped YBa2Cu3O7−δ (YBCO) composite thick films were examined. All the composite films were synthesized by diffusion reaction technique. The structural and morphological analysis were investigated through X-ray powder diffraction along with Rietveld refinement and Field emission scanning electron microscopy (FESEM) respectively. The transport measurement suggested that the inclusion of ferromagnetic LSMO decreases the superconducting transition temperature ( $$ T_{C}^{on} $$ ) and enhances the residual resistivity (ρ0). The broadening of resistive transition occurs below the onset transition temperature and shows the dissipative flux pinning. Various superconducting parameters were obtained from the excess conductivity analysis of the composite films and were in good agreement with the experimental findings. The mechanical strength of all the composite films was explained through different models like Hays–Kendall model, Elastic/Plastic deformation model and Proportional specimen resistance model.

Butylglyceryl Pectin Nanoparticles: Synthesis, Formulation and Characterization.

Pectin is a polysaccharide with very good gel forming properties that traditionally has found important applications in foods and pharmaceutical industries. Although less studied, chemical modifications of pectin leading to a decrease in its hydrophilicity can be useful for the development of novel drug carriers. To this aim, butylglyceryl pectins (P-OX4) were synthesized via functionalization with n-butylglycidyl ether and subsequently formed into nanoparticles. Chromatographic, spectroscopic, and thermal analytical methods were employed to characterize the novel butylglyceryl pectins (P-OX4) obtained, prior to their formulation into nanoparticles via nanoprecipitation. Nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectroscopy confirmed a degree of modification in these materials in the range 10.4–13.6%, and thermal stability studies indicated an increase in both the thermal decomposition onset and glass transition temperature values (compared to those of the original pectin). An increase in the molecular weight and a decrease in the viscosity of P-OX4, when compared to the starting material, were also observed. The resulting nanoformulations were investigated in terms of particle morphology, size and stability, and it was found that particles were roughly spherical, with their size below 300 nm, and a negative zeta potential (−20 to −26 mV, indicating good stability). Having demonstrated the ability to load Doxorubicin at the level of 10%, their potential in drug delivery applications warrants further investigations.

Effect of Nano-Sized Nickel Ferrite Addition on Superconducting Properties of (Tl<sub>0.85</sub>Cr<sub>0.15</sub>)Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>7-δ</sub> Superconductors

The effect of nanosized nickel ferrite (NiFe2O4) addition on (Tl0.85Cr0.15)Sr2CaCu2O7-δ superconductors has been investigated. (Tl0.85Cr0.15)Sr2CaCu2O7-δ high temperature superconductors was prepared via solid-state reaction method using high purity oxide powders. Nanosized NiFe2O4 was added to the compound at composition x = 0 - 0.003 wt.%. Samples were studied using scanning electron microscopy (SEM), X-ray diffraction method (XRD), electrical resistance versus temperature, transport critical current density Jc and AC susceptibility measurements. SEM micrographs showed close-packed microstructure with low porosity. XRD patterns showed a dominant phase of Tl-1212 with a minor phase of Tl-1201 for all samples. All of the samples displayed metallic normal state behavior before the onset transition temperature (Tc-onset) which was between 102 and 104 K. The transition temperature (Tcχ’) from AC susceptibility measurement also showed the similar results between 101 and 103 K. Tc-zero was slightly suppressed with the addition of nanosized NiFe2O4. The peak temperature Tp from the imaginary part of the susceptibility χ” was found between 77 - 91 K for all samples. The highest transport critical current density (Jc) at 77 K was shown by sample x = 0.001 wt.% at 2213 mAcm-2. Nanosized NiFe2O4 has significantly enhanced the Jc of (Tl0.85Cr0.15)Sr2CaCu2O7-δ superconductor.

Superconductivity and Fermi Surface Anisotropy in Transition Metal Dichalcogenide NbTe2**Supported by the National Basic Research Program of China under Grant Nos 2018YFA0305600 and 2017YFA0303302, the National Natural Science Foundation of China under Grant Nos 11888101, 11774008, 11704414 and 11427805, the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDB28000000, and Beijing Natural Science Foundation (Z180010).

Transition metal dichalcogenides, featuring layered structures, have aroused enormous interest as a platform for novel physical phenomena and a wide range of potential applications. Among them, special interest has been placed upon WTe2 and MoTe2, which exhibit non-trivial topology both in single layer and bulk as well as pressure induced or enhanced superconductivity. We study another distorted 1T material NbTe2 through systematic electrical transport measurements. Intrinsic superconductivity with onset transition temperature () up to 0.72 K is detected where the upper critical field (Hc) shows unconventional quasi-linear behavior, indicating spin-orbit coupling induced p-wave paring. Furthermore, a general model is proposed to fit the angle-dependent magnetoresistance, which reveals the Fermi surface anisotropy of NbTe2. Finally, non-saturating linear magnetoresistance up to 50 T is observed and attributed to the quantum limit transport.

Giant anisotropy in superconducting single crystals of CsCa2Fe4As4F2

CsCa$_2$Fe$_4$As$_4$F$_2$ is a newly discovered iron-based superconductor with $T_\mathrm{c}\sim$ 30 K containing double Fe$_2$As$_2$ layers that are separated by insulating Ca$_2$F$_2$ spacer layers. Here we report the transport and magnetization measurements on CsCa$_2$Fe$_4$As$_4$F$_2$ single crystals grown for the first time using the self flux of CsAs. We observed a huge resistivity anisotropy $\rho_c(T)/\rho_{ab}(T)$, which increases with decreasing temperature, from 750 at 300 K to 3150 at 32 K. The $\rho_c(T)$ data exhibit a non-metallic behavior above $\sim$140 K, suggesting an incoherent electronic state at high temperatures due to the dimension crossover. The superconducting onset transition temperature in $\rho_{ab}$ is 0.7 K higher than that in $\rho_c$, suggesting two-dimensional (2D) superconducting fluctuations. The lower and upper critical fields also show an exceptional anisotropy among iron-based superconductors. The $H_{c1}^\bot(T)$ data are well fitted using the model with two $s$-wave-like superconducting gaps, $\Delta_1(0)=6.75$ meV and $\Delta_2(0)=2.32$ meV. The inter-plane coherence length $\xi_c(0)$ is $3.6$ \AA, remarkably smaller than the distance between conducting layers (8.6 \AA), consolidating the 2D nature in the title material.

Effect of alkali metal Na on the formation and superconductivity of Tl-1212-type phase (Tl0.85Cr0.15)Sr2−xNaxCaCu2O7

The effect of Na substitution on the formation and superconductivity of Tl-1212-type phase (Tl0.85Cr0.15)Sr2−xNaxCaCu2O7 (x = 0–0.30) is reported. The samples were prepared via the solid-state reaction method. X-ray diffraction patterns showed the presence of Tl-1212-type phase or Ca0.3Sr0.7CuO2 (CSCO) as a major or minor phase in the samples. The resistance versus temperature curves showed onset transition temperature, Tc-onset between 97 and 106 K and zero-resistance temperature, Tc-zero between 88 and 99 K. AC susceptibility measurement showed superconducting transition $${T_{{\text{c}}{\chi ^\prime }}}$$ between 89 and 98 K. The peak temperature, Tp, of the imaginary part of the susceptibility, χ″, was the highest for x = 0.02 sample (Tp = 96 K). The inter-grain critical current density, Jc, at Tp for x = 0 sample was Jc (Tp = 68 K) = 14 A cm−2 and for x = 0.02, 0.20 and 0.30 Jc (Tp) at 96, 96, and 88 K, respectively, is 19 A cm−2. Na substitution increased the grain size of the Tl-1212 samples. All Na-substituted samples showed higher transition temperature, enhanced critical current density, and improved inter-grain coupling compared with the non-substituted sample. This work showed that other than rare-earth elements, monovalent alkali metal such as Na could also be used to enhance the superconducting properties of the Tl-1212 phase.

Superconductivity of the hydrogen-rich metal hydride Li5MoH11 under high pressure

Ternary metal hydrides are convenient and valuable systems for investigating the metallization and superconductivity of metal hydrides because they can be synthesized under mild conditions and recovered under ambient pressure. In this study, the conducting behavior and structural phase transition of a hydrogen-rich metal hydride, $\mathrm{L}{\mathrm{i}}_{5}\mathrm{Mo}{\mathrm{H}}_{11}$, were investigated at pressures up to 210 GPa in a diamond anvil cell. The results showed that $\mathrm{L}{\mathrm{i}}_{5}\mathrm{Mo}{\mathrm{H}}_{11}$ transforms from an insulator to a poor metal at around 100 GPa. Superconductivity was observed at 100 GPa and retained until 210 GPa, and its maximum onset transition temperature was 6.5 K at 160 GPa. High-pressure synchrotron x-ray diffraction experiments revealed that the ambient-pressure hexagonal crystal structure is retained until at least 130 GPa. Furthermore, apart from the influence of pressure on the conducting behavior of $\mathrm{L}{\mathrm{i}}_{5}\mathrm{Mo}{\mathrm{H}}_{11}$, the effect of annealing time on the conducting and superconducting behaviors at room temperature and high pressure were also observed. We hypothesized that this time-dependent behavior is due to the restoration of the $\mathrm{Mo}{\mathrm{H}}_{9}$ cage structure after distortion or rotation caused by pressurization. These findings provide insight on the conducting and superconducting behaviors of ternary metal hydrides that, until recently, have been mostly studied by theoretical methods.

Kinetic Study for Comprehensive Understanding of Solid-State Polymorphic Transitions of Nicotinamide/Pimelic Acid Cocrystals

Solid-state polymorphic transition (SSPT) has been regarded as an interesting research subject for a long time, but kinetics and the mechanism of these phase transitions are still not fully understood. Particularly, kinetic studies on the SSPT process of cocrystals are not widely reported even though extensive novel cocrystal polymorphs have been discovered over the recent decades. Herein we presented a comprehensive kinetic study of the enantiotropic polymorphic system of 1:1 nicotinamide (NA)–pimelic acid (PA) cocrystals with the combination of various analytical methods. Bulk kinetic studies conducted with powder X-ray diffraction and differential scanning calorimetry indicated that both directions of SSPT (form 1 ↔ form 2) occur by a nucleation and growth mechanism. In addition, large activation energy barriers of form 1 → form 2 with a wide range (337.1–514.2 kJ mol–1) and variations in the onset transition temperature were observed, depending on the crystal conditions. In situ atomic force microscopy analysis was also carried out to monitor the surface morphology change at the nanoscale to supplement the bulk kinetics.

Probing particle-matrix interactions during magnetic particle spectroscopy

Abstract Interactions between magnetic nanoparticles (MNPs) and their surrounding matrix were investigated during temperature-controlled magnetic particle spectroscopy (MPS). MNPs are used as tracers in emerging biomedical imaging technologies, including magnetic particle imaging (MPI), which employ spatially inhomogeneous time-varying magnetic fields to generate imaging signals. For safe and reliable imaging procedures, it is important to understand the thermal and mechanical interactions between MNPs and the surrounding biological matrix. We performed in-vitro investigations using magnetic field hyperthermia (MFH) and temperature-controlled MPS to elucidate the excitation-field dependent MNP-matrix interaction. MFH measurements of ferucarbotran (FCT) MNPs were conducted using a low-frequency, high-amplitude, set-up designed to emulate the typical field conditions employed in MPI. First, it was tested whether concentrated FCT samples produce measurable heating in MFH characterization. A strong bulk heating effect (ΔT = 40 K) was observed, showing that the individual MNPs dissipate a significant quantity of heat. However, no measurable bulk temperature increase occurred during MFH of dilute FCT preparations in liquid or gelatin suspensions. Then, temperature-controlled MPS measurements were performed on dilute FCT immobilized in gelatin. The melting transition of the dilute gelatin preparation produced a clear change in the temperature-dependent MPS spectra. The melting transition was reproducible between measurements using the same field excitation, with a standard deviation of σ = 0.2 K. The melting transition temperature was found to depend upon the amplitude of the MPS excitation field. A reduction in the melting transition onset temperature of 2.3 K was observed when the excitation amplitude was increased from 6 mT to 25 mT. This shift is attributed to increasing mechanical and thermal particle-matrix interactions at higher excitation fields. The results show that within the studied system, individual MNPs interact with their local environment in a non-negligible way during MPS measurement, even when bulk heating of the sample is not detected. Our findings hold significance for the potential impact of MPI and related technologies on living tissues, a subject deserving of further study.