Paramagnetic Research Articles

A comparative study of solid-solution strengthening in Cr-Co-Ni complex concentrated alloys: The effect of magnetism

The effect of magnetism on the solid solution strengthening (SSS) of CrxCoyNi1–x–y alloys formulated by Varvenne’s and Toda-Caraballo’s (TC’s) models has been investigated comparatively by first-principles. It is found that for a reliable estimation of the model parameters for the paramagnetic (PM) and ferromagnetic (FM) alloys one should adopt the atomic radii and elastic moduli of the constituent metals corresponding to the same magnetic state. Furthermore, we show that Varvenne’s model underestimates the SSS when compared to the experimental data, while TC’s model correctly predicts the SSS of PM CrxCoyNi1–x–y alloys when adopting the PM parameters as inputs. Therefore, the magnetic states should be correctly accounted when estimating the atomic radii and elastic moduli of the constituent elements as input parameters for both models to capture the SSS in complex concentrated alloys properly.

Ab initio study of the structural response to magnetic disorder and van der Waals interactions in FeSe

The electronic structure in unconventional superconductors holds a key to understand the momentum-dependent pairing interactions and the resulting superconducting gap function. In superconducting Fe-based chalcogenides, there have been controversial results regarding the importance of the $k_z$ dependence of the electronic dispersion, the gap structure and the pairing mechanisms of iron-based superconductivity. Here, we present a detailed investigation of the van der Waals interaction in FeSe and its interplay with magnetic disorder and real space structural properties. Using density functional theory we show that they need to be taken into account upon investigation of the 3-dimensional effects, including non-trivial topology, of FeSe$_{1-x}$Te$_x$ and FeSe$_{1-x}$S$_x$ systems. In addition, the impact of paramagnetic (PM) disorder is considered within the spin-space average approach. Our calculations show that the PM relaxed structure supports the picture of different competing ordered magnetic states in the nematic regime, yielding magnetic frustration.

B-site substitution impact on structural and magnetocaloric behavior of La0.55Pr0.1Sr0.35Mn1-xTixO3 manganites

Structural, magnetic and magnetocaloric properties of perovskite manganite La0.55Pr0.1Sr0.35Mn1-xTixO3 (LPSMTxO, x ​= ​0; 0.05) synthetized by sol–gel method have been studied. X-ray diffraction studies have shown that all samples have been crystallized in rhombohedral symmetry withR3¯c space group. The magnetic study revealed that the samples have exhibited a ferromagnetic (FM) – paramagnetic (PM) phase with decreasing Curie temperature (TC) from 310 ​K to 288 ​K when Ti doping level increases. At μ0H ​= ​3T, the maximum value of the magnetic entropy change (−ΔSMmax)varies from 3.58 ​J/kg.K to 2.78J/kg.K for x ​= ​0.00 and 0.05 respectively. Besides, by performing the Landau theory, the deviation between experimental and theoretical calculations have indicated the noncontributing of elastic, magnetoelastic and magnetoelectronic coupling in the magnetocaloric properties of La0.55Pr0.1Sr0.35Mn1-xTixO3. Accordingly, important results of the relative cooling power (RCP) for the two investigated compounds were obtained proving that they can be suggested as good candidates for magnetic refrigeration technology.

A comparative study between GGA, WC-GGA, TB-mBJ and GGA + U approximations on magnetocaloric effect, electronic, optic and magnetic properties of BaMnS2 compound: DFT calculations and Monte Carlo simulations

The magnetocaloric effect, electronic, optical and magnetic properties of BaMnS2 are studied using the Wu-Cohen-Generalized Gradients Approximation (WC-GGA), GGA, Tran and Blaha modified Becke-Johnson potential (TB-mBJ) and GGA + U(U is the Hubbard potential) approximations and Monte Carlo simulations. BaMnS2 has an antiferromagnetic behavior and a semiconductor character with a narrow band gap follows the trend WC-GGA < GGA < mBJ < GGA + U. The GGA + U transformed and increased the nature of the band gap, causing an apparent change in physical properties. The difference energy calculated between the magnetic configurations confirms that the ground state antiferromagnetic (AFM) is more stable than the paramagnetic (PM) states. The total magnetization, susceptibility, specific heat and magnetic entropy and relative cooling power of this compound are studied. The maximum value of the magnetic entropy was obtained near the paramagnetic AFM- PM transition for (WC-GGA, GGA) and GGA + U equal to 38.31 J.kg−1.K−1 and 16.72 J.kg−1.K−1 respectively.

Appearance of Griffiths phase and the magnetocaloric effect in Pr- and (Pr, Bi)- doped ZnO nanoparticles

We have investigated the effect of Pr and (Pr,Bi) doping on the structural, magnetic and magnetocaloric properties of ZnO. All the samples were prepared via the sol gel method. X-ray diffraction (XRD) analysis revealed that Pr and Pr,Bi introduction forms a secondary phase of Pr6O11 for Pr0.01Zn0.97O and Pr0.01Bi0.01Zn0.97O. According to the magnetic properties, our samples underwent a second order phase transition from ferromagnetic (FM) to paramagnetic (PM) at Curie temperature (TC).The deviation of the inverse curve of the magnetic susceptibility from Curie-Weiss law(CW) indicates the existence of a Griffiths phase(GP) for Pr0.01Zn0.97O and Pr0.01Bi0.01Zn0.97O. The magnetocaloric effect (MCE) was assessed using magnetic entropy change (ΔSM) which is basically determined from the magnetic field dependence of magnetization at different temperatures M(µ0H,T) near TC. The maximum magnetic entropy change |ΔSMMax| and the relative cooling power (RCP) were respectively 1.36, 1.34 and 1.17 J/kg.K and 107, 109 and 86 J/kg at a field change of 5T for ZnO, Pr0.01Zn0.97O and Pr0.01Bi0.01Zn0.97O. These values compared favorably with some other reported materials, making our samples promising candidates for magnetic refrigeration.

Structural, magnetic and magneto-transport properties of Pr0.5Ca0.5Mn0.9V0.1O3: Indication of large field coefficient of resistance (FCR)

Structural, magnetic and magneto-transport properties of polycrystalline Pr0.5Ca0.5Mn0.9V0.1O3 have been studied. The incorporation of vanadium attributes to enhancement in the Mn3+/Mn4+ ratio as well as density of conducting eg carriers, which affects the magnetic and electrical behavior of the system. On cooling, a multi-phase separated “paramagnetic (PM) – charge-ordered antiferromagnetic (COAFM) – ferromagnetic (FM) – reentrant spin glass (RSG)” phases are observed with the characteristic charge ordering temperature TCO = 233 K and Neel temperature TN = 143 K. Field-induced first-order magnetic phase transition from a charge-ordered antiferromagnetic state to a ferromagnetic cluster glass state takes place at TC = 44 K. A 7 T magnetic field induces metal–insulator transition at TMI = 163 K. At low temperatures, strong memory-effect and colossal magnetoresistance (CMR) ~ 99.99% are observed in resistivity data. The sample shows a high field coefficient of resistance (FCR) value of about 855% in the low-temperature regime.

Structural, magnetic, magnetocaloric properties and critical behavior of La0.62Nd0.05Ba0.33MnO3 elaborated by co-precipitation process

La0.62Nd0.05Ba0.33MnO3 nanoparticles were prepared using co-precipitation process. Single phase compound formation was confirmed using X-ray diffraction analysis. The elaborated sample annealed at 1000 °C in air during 10 h, crystallizes in the rhombohedral perovskite structure with R-3c space group. Magnetic measurements reveal the presence of a magnetic transition from paramagnetic (PM) to ferromagnetic (FM) phase in the vicinity of Curie temperature (270 K). Furthermore, the Arrott plots reveal a second order magnetic transition. Interestingly, La0.62Nd0.05Ba0.33MO3 sample presents a large relative cooling power (RCP) it is 315 J.kg−1 at 5 T). The critical exponents were studied by both approaches: Modified Arrott plots and Kouvel Fisher.

Synthesis, structural characterization, and studies of magnetic and dielectric properties of Gd3+ doped cerium oxide (Ce0.90Gd0.10O2−δ)

To improve and modify the magneto-dielectric properties of cerium oxide, fractional incorporation of Gd3+ ions in place of Ce4+ in the pristine lattice was considered. Samples of Gd3+ substituted CeO2 (i.e., Ce0.90Gd0.10O2−δ, CGO) were synthesized by the solid state reaction method where the starting materials of CeO2 and Gd2O3 were heat treated at 800 °C for 10 h. X-ray diffractograms were recorded and analyzed by the Rietveld refinement method to confirm the formation of cubic structure as well as the proper and partial replacement of host cations of Ce4+ by strong magnetic impurity of Gd3+ ions. Transmission electron microscopy study of doped sample of Ce0.90Gd0.10O2−δ was carried to yield some important morphological behavior. The static magnetic measurements were performed by superconducting quantum interference device magnetometer. Interestingly nonlinearity due to onset of magnetic ordering was introduced which was clearly found in recorded magnetization (M) vs. field (H) curve below ~ 50 K. Analysis of magnetic behavior suggests the initiation of paramagnetic to ferromagnetic phase transition at low temperatures (below ~ 50 K). Hysteresis loops observed below ~ 50 K also suggest the onset of magnetic ordering in the doped sample, but saturation magnetization was not found owing to the fact that most of the host cations are in paramagnetic phase. The M–T curve is well fitted below ~ 50 K by a combined equation generated from 3D spin wave model and the Curie–Weiss law indicates the coexistence of paramagnetic (PM) and ferromagnetic (FM) phases in the sample. The onset of ferromagnetism in Ce0.90Gd0.10O2−δ was explained by oxygen vacancy mediated F-center exchange (FCE) coupling mechanism. Dielectric constant and ac conductivity increases with increase of temperature and frequency. The improved version of magnetic and electric properties of doped cerium oxide may be a potential candidate for dilute magnetic dielectric for applications in charge storage and sensor devices.

Unique magnetic properties of Nd based cuprate francisite: Major enhancement upon Co doping

To understand the physical mechanism of intralayer ferromagnetic (FM) and interlayer antiferromagnetic (AFM) interactions in quasi-two-dimensional model of a real three-dimensional system, rare earth (RE)-Nd based cuprate francisite, Cu3Nd(SeO3)2O2Cl (NdCufr) was doped with Co and studied using structural (X-ray diffraction technique), magnetic (temperature and field dependent magnetization and specific heat measurements) and local structural (X-ray absorption technique) techniques supported by first principle theoretical calculation. The structure of the samples is orthorhombic and doped specimens indicate more or less substitutional incorporation of Co at Cu site. The magnetic properties highlighted with two transitions, viz. AFM to paramagnetic (PM) transition around 30 K and a spin reorientation transition (SRT) below 10 K. Two phenomena viz. magnetic hysteresis below SRT and magnetic field induced metamagnetic transition (MMT) were observed. Co doping significantly enhanced these two phenomena in addition to change the transition temperatures. The concomitant change and enhancement of magnetic properties by Co doping has been interpreted using splitting scheme of Cu-d and Nd-f states. The local structure study corroborates the overall findings and detects the cause of unexpected trend of magnetism with increasing Co doping.

Magnetic properties of La0.55CaxSr0.45−xMnO3 perovskite manganite

Conventional solid-state reaction technique was used to prepare the studied samples La0.55CaxSr0.45−xMnO3 (x = 0.0, 0.1, 0.2). Their structural and magnetic properties have been investigated to find the effect of calcium doping on the D.C. and A.C. magnetic properties of the compounds. Room temperature XRD investigations confirm rhombohedral structure with space group R-3c for all the samples. Lattice parameter is found to decrease with increase in Ca(x) content. Microstructure was examined from the images taken by Scanning Electron Microscopy (SEM) and chemical compositions were determined by an energy dispersive X-ray diffractometer (EDX). The zero-field cooled (ZFC) and field cooled (FC) DC magnetization measurements reveal paramagnetic (PM) to ferromagnetic (FM) transition in them upon cooling through their Curie temperature (TC). But the FM state coexists with the residual canted anti-ferromagnetic state rather than a pure FM state in the samples. The TC values are dependent on Ca(x) content of the samples. Moreover, XRD analysis and EDX data reveals the presence of Mn deficiency in the studied samples. Presence of minor secondary Mn3O4 phase creates this deficiency resulting a significant decrease in TC and strongly influences the magnetic properties. The values of A.C. permeability (μʹ) also depend on Ca(x) content as well as grain size that can be explained by Globus equation. However, μʹ values of the samples remain almost constant over a wide range of frequency which indicates the compositional stability of the perovskites. The magnetic modulus demonstrates the dynamics of their A.C. permeability by screening out the stray/any other effects in them. The Nyquist plots of magnetic modulus of the samples show the type of their magnetic relaxation.

Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd0.6Sr0.4MnO3 manganite.

Nd0.6Sr0.4MnO3 polycrystalline manganite was synthesized by two different methods: the auto-combustion reaction (NSMO-AC) and the sol–gel method (NSMO-SG). The structural, magnetic, magnetocaloric and critical behavior of the samples were examined. Rietveld refinements of the XRD patterns revealed that both compounds are pure single phase indexed to the orthorhombic system adopting the Pnma space group. The nanometric size estimated using the Williamson–Hall method was confirmed by TEM micrographs. Magnetic measurements as a function of temperature indicated that both samples underwent a second order ferromagnetic (FM)–paramagnetic (PM) phase transition at Curie temperature (TC). The relative cooling power was observed to be around 95.271 J kg−1 for NSMO-AC and 202.054 J kg−1 for NSMO-SG at μ0H = 5 T, indicating that these materials are potential candidates for magnetic refrigeration application close to room temperature. The critical behavior was estimated using diverse techniques based on the isothermal magnetization data recorded around the critical temperature TC. The calculated values are fully satisfactory to the requirements of the scaling theory, implying their reliability. The estimated critical exponents matched well with the values anticipated for the mean-field model and the 3D Ising model for NSMO-AC and NSMO-SG, respectively, showing that the magnetic interactions depended on the process of elaboration.

Giant Reversible Barocaloric Effect with Low Hysteresis in Antiperovskite PdNMn &lt;sub&gt;3&lt;/sub&gt; Compound

Barocaloric (BC) refrigeration is a new type of clean and energy-efficiency refrigeration technology. However, the giant and colossal BC effects are mainly based on the first-order phase transitions, leading to the unfavorable hysteresis. Here we report the giant BC effect along with weak hysteresis at the antiferromagnetic (AFM) to paramagnetic (PM) phase transition (TN =283 K) in antiperovskite PdNMn 3 compound. The reversible isothermal entropy change reaches 28.3 J kg-1K-1 under 290 MPa. The hysteresis is only about 2 K, which is associated with a small volumetric change ΔV/V at TN (~0.2%). The magnetic entropy is proposed to mainly contribute to the entropy change at TN , which compensates for the reduced lattice contribution due to the small ΔV/V . Our result demonstrates the possibility of realizing giant BC effect together with weak hysteresis in materials where both crystallographic and non-crystallographic entropy changes cooperate at the first-order phase transition (FOPT).

Effects of paramagnetic fluctuations on the thermochemistry of MnO(100) surfaces in the oxygen evolution reaction.

We investigated the effects of paramagnetic (PM) fluctuations on the thermochemistry of the MnO(100) surface in the oxygen evolution reaction (OER) using the "noncollinear magnetic sampling method plus U" (NCMSM+U). Various physical properties, such as the electronic structure, free energy, and charge occupation, of the MnO(100) surface in the PM state with several OER intermediates, were reckoned and compared to those in the antiferromagnetic (AFM) state. We found that PM fluctuation enhances charge transfer from a surface Mn ion to each of the intermediates and strengthens the chemical bond between them, while not altering the overall features, such as the rate determining step and resting state, in reaction pathways. The enhanced charge transfer can be attributed to the delocalized nature of valence bands observed in the PM surface. In addition, it was observed that chemical-bond enhancement depends on the intermediates, resulting in significant deviations in reaction energy barriers. Our study suggests that PM fluctuations play a significant role in the thermochemistry of chemical reactions occurring on correlated oxide surfaces.

Structural and magnetic properties of the layered perovskite system Sr2−xPrxCoO4 (x = 0.7, 0.9, 1.1)

We report the detailed structural and temperature dependent magnetic properties of well characterized, polycrystalline samples of Sr2−xPrxCoO4 (x = 0.7, 0.9, 1.1), in the temperature range 5 K–300 K. In Sr2−xPrxCoO4 (0.7 ≤x≤ 1.1), short range or long range ferromagnetic (FM) order appears below TC~ 150 K. In general the low temperature magnetic state is a mixture of FM, paramagnetic (PM) and antiferromagnetic (AFM) matrices. The spin glass phase (SG) is observed in Sr1.1Pr0.9CoO4 below Tf = 15 K due to comparable strengths of FM and AFM interactions. With increasing x, the Jahn-Teller distortion weakens the FM interaction and AFM interaction starts dominating. Isothermal remanent magnetization (IRM) as a function of time (t) shows that the relaxation mechanism is associated with the interfaces between different types of magnetic matrices.

Magnetic Phase Transition, Elastic and Thermodynamic Properties of L12-(Ni,Cu)3(Al,Fe,Cr) in 3d High-Entropy Alloys

The phase stability and elastic properties of paramagnetic (PM), ferromagnetic (FM) and antiferromagnetic (AFM) phases in L12-(Ni,Cu)3(Al,Fe,Cr) alloy are first investigated using the exact muffin-tin orbitals (EMTO) method in combination with the coherent potential approximation (CPA). The result shows the AFM structure phase of the three is the most stable in the ground state. Calculated elastic constants show that all the phases are mechanically stable, and have uncovered that L12-(Ni,Cu)3(Al,Fe,Cr) can achieve good strength and ductility simultaneously. Then, crucial thermal properties are described satisfactorily using the Debye–Grüneisen model, showing heat capacity, Gibbs free energy G, the competitive contribution of entropy −TS and enthalpy H exhibiting significant temperature dependences. Moreover, the magnetic phase transition thermodynamics was studied, which suggests that −TS has a primary contribution to Gibbs free energy and may play a key role in the phase transition. The present results can benefit the understanding of the mechanical, thermodynamic and magnetic properties of the L12 structure phase in 3d high-entropy alloys.

Simple manufacturing and metal type-dependent properties of M3 (OH)2 V2 O7·nH2 O (M; Co, Ni, Cu, Zn) nanostructures

M3(OH)2V2O7·nH2O ( M : Co, Ni, Cu, Zn) nanostructures were synthesized by a simple and economic chemical precipitation route. For Co and Ni compounds, very small (~9 nm), irregularly shaped and poor crystalline nanoparticles occurred, probably due to high tendency for complexing with ammonia molecules releasing from ammonium metavanadate. However, more crystalline Co compounds could be synthesized in high reactant concentrations, but not for Ni. Zn and Cu compounds are well crystallized in the hexagonal and monoclinic unit cell, respectively. Their shapes were nanoflake or nanoplate and their thickness were about 20 nm and 25 nm, respectively. Both have an average diameter of less than 500 nm. The chemical formulas determined were Co3V2O7(OH)2·2.8H2O, Ni3V2O7(OH)2·5.6H2O, Cu3V2O7(OH)2·2H2O and Zn3V2O7(OH)2·2.8H2O. The band gaps of samples were found in the range from 3.22 to 4.34 eV. Magnetic measurements show that all Co samples have a magnetic transition from ferromagnetic (FM) to paramagnetic (PM) around 300 K, on the ground that samples with FM characteristics and coupling at 5 K temperature turn into PM samples at room temperature. These results are important for large-scale synthesis of nanovanadate structures.

Magnetic and magnetocaloric properties in Nd1-3xBax Cax SrxMnO3 (x=0.11and 0.133) perovskite manganites

A systematic investigation of structural, magnetic and magnetocaloric properties for Nd1-3xBax Cax SrxMnO3 (x ​= ​0.11 and 0.133) manganites is reported. X-ray powder diffraction (XRD) patterns suggest that our samples crystallize in the orthorhombic perovskite structure with a Pbnm space group. Magnetization temperature dependence under the field-cooled cooling (FCc), field-cooled warming (FCw) and zero-field-cooling (ZFC) modes exhibit a ferromagnetic(FM)- paramagnetic(PM) phase transition at TC temperature increasing from 120 ​K for x ​= ​0.11–145 ​K for x ​= ​0.133. An analysis using the Banerjee’s criterion curves near TC indicates that x ​= ​0.11 displays a second-order transition while x ​= ​0.133 displays a first order magnetic phase transition. The analysis is further confirmed by the phenomenological universal curves of the normalized entropy variation as a function of rescaled temperature. The maximum magnetic entropy change (−ΔSMmax) and relative cooling power (RCP) were estimated to 1.68 ​J /kg K and 89.45 ​J /kg for x ​= ​0.11 and 4.11 ​J/kg K and 132.45 ​J /kg for x ​= ​0.133 under 3T, respectively. The experimental approach mixing three different alkaline earth on the A-site perovskite significantly improves the broadening of the magnetic entropy change temperature dependence and then the relative cooling refrigerant capacity. Such approach can be transferred to manganite showing ferromagnetic to paramagnetic phase transition near room temperature for magnetic refrigeration application.

Experimental study and DFT calculation of the oxygen deficiency effects on structural, magnetic and optical properties of La0.8□0.2MnO3-δ (δ = 0, 0.1 and 0.2) compounds

In this work, our main focus is to study the effect of oxygen vacancy on structural, magnetic, and optical properties of La0.8□0.2MnO3-δ (δ = 0, 0.1 and 0.2) manganites. The refinement of X-ray diffraction patterns shows that the samples with δ = 0 and 0.1 crystallize in the rhombohedral phase with R3¯c space group. Also, for δ = 0.2 the refinement has revealed the coexistence of R3¯c rhombohedral and Pnmaorthorhombic phases. The magnetic measurements M (T) shows that our samples have a transition from the ferromagnetic (FM) state to the paramagnetic (PM) state by increasing the temperature. The increase of oxygen deficiency rate causes a spin-glass-like state at low temperature with the presence of Griffiths phase above Curie temperature. Moreover, the hysteresis loop analysis shows an increase in the remanent magnetization and the coercive field when the creation of oxygen deficiency. Also, we find an agreement between experimental results and a theoretical study using ab initio density functional theory (DFT) based on correct Spin polarized Generalized Gradient Approximation SGGA + U. The results of the optical properties calculation revealed that our compounds could produce high absorption in the ultraviolet range.

Giant magnetocaloric effect and magnetic properties of nanocomposites of manganite Nd1-xSrxMnO3 (0.0 ≤ x ≤ 0.8) synthesized using modified sol-gel method

The magnetocaloric effect in an array of nanocomposites manganite Nd1-xSrxMnO3 (x = 0.0, 0.2, 0.4, 0.6 and 0.8) was reported in this study. The nanocomposites were synthesized using auto-combustion sol-gel technique where replacing Nd3+ by Sr2+ influence the structure and hence enhancing the magnetic properties and magnetocaloric effect. The synthesized nanocomposites form an orthorhombic crystal structure with Pnma space group No.62 and the average crystallite size was found to be ∼30 nm. The tunning (Mn4+/Mn3+) ratio varies in the nanocomposites with different concentration where the Nd0.6Sr0.4MnO3 nanocomposite exhibits maximum (Mn4+/Mn3+) ratio. The ZFC-FC magnetization measurements indicate that all samples exhibit ferromagnetic (FM) to paramagnetic (PM) transition with increasing temperature and other phase transitions are observed for all samples except Nd0.6Sr0.4MnO3 which also shows a peak Curie temperature (TC = 256 K) in the vicinity of room temperature. The presence of FM in NdMnO3 sample is highly enhanced via FM double exchange (DE) interaction due to self-doping process. Room temperature hysteresis loop reveals paramagnetic (PM) behaviour whereas the pronounced effect presents in Nd0.6Sr0.4MnO3 compound compared to other compounds. However, all compounds exhibit FM behaviour at low temperature measurements with saturation magnetization (Ms) raising up gradually and reaching its maximum at x = 0.4. The magnetic entropy change | ΔSM | is calculated through isotherms measurements and Nd0.6Sr0.4MnO3 nanocomposite exhibits a relatively giant value of magnetic entropy (12.71 J/kg.K and 7.78 J/kg.K at around 257.5 K) under a maximum applied magnetic field of 9 T and 5 T respectively. The corresponding relative cooling power (RCP) for this compound is found accordingly as 636.9 J/kg and 349.8 J/kg. The obtained results in the wide range of temperature starting from very low temperature up to room temperature recommend Nd0.6Sr0.4MnO3 compound as a good potential material for magnetic cooling.

Structure, magnetism and electrical transport in La1-x-yPryCaxMnO3 (y = 0.30, 0.35, 0.40; x = 0.40): Consequences of the interplay between intrinsic ionic radius and extrinsic particle size

The structural, microstructural, magnetic and electrical transport properties have been correlatively studied to decipher the complex consequences of variation of intrinsic parameter ,the average La-site cationic radii and extrinsic particle size on the magneto-electrical phase coexistence in La1-x-yPryCaxMnO3 (y = 0.30, 0.35, 0.40; x = 0.40). Polycrystalline powders prepared by sol-gel route were sintered at 600 °C, 900 °C, 1100 °C, and 1300 °C to facilitate particle size variation. Rietveld refinement of the powder X-ray diffraction data confirms that all samples have an orthorhombic structure with Pnma space group. The lattice constants decrease with decreasing ionic radii, while at a fixed ionic radius, the enhanced particle size increases them. The average apical Mn−O−Mn bond angles and the average Mn−O bond lengths decrease with rising ionic radii but increase with particle size at a fixed composition. Magnetization measurements show sequential paramagnetic (PM)-antiferromagnetic (AFM)-ferromagnetic (FM) transitions on lowering the temperature is lowered. The AFM-FM transition exhibits (i) pronounced hysteresis between field-cooled cooling (FCC) and field-cooled warming (FCW) (ii) strong divergence between zero-field cooling (ZFC) and FCW curves. The low-temperature magnetic state transforms from spin glass-like to a cluster glass-like as the ionic radii or the particle size decreases. These behaviors are caused by the mesoscale modifications in the magnetic phase profile where the AFM and FM phases due to the interplay between the average La-site cationic radii and the particle size. In general, the FM component increases with an increase in the particle size, but it decreases at lower ionic radii. The presence of a large thermal hysteresis in the insulator-metal transition (IMT) coupled with the one in FCC-FCW magnetization at particle sizes ~200 nm–160 nm, and ~460-400 nm demonstrates that this particle size regime is the most conducive to the phase separation. IMT disappears at smaller ionic radii and larger particle sizes due to the enhancement of AFM and charge-ordering. The PM and AFM regimes in all samples reveal variable range hopping conduction with particle size and ionic radii dependent activation. The observed phenomena have been explained in terms of the interplay between the ionic radii and particle size induced changes in the average apical Mn−O−Mn bond angles and the average Mn−O bond length.