Temperature Dependence Of Magnetization Research Articles

Study of magnetic and magnetocaloric properties of FeMnO3 compound

Abstract The study reports a magnetocaloric effect (MCE) in the FeMnO3 bixbyite compound prepared via autocombustion technique using nitrate salts. The X-ray diffraction (XRD) study showed that FeMnO3 assumes a cubic phase with a space group Ia-3. X-ray photoelectron spectroscopy (XPS) study confirmed the oxidation states of Fe3+ and Mn3+. Temperature-dependent magnetization measurements revealed the presence of antiferromagnetic ordering in the compound at around 40 K. The effective magnetic moment, µ eff, was calculated as 2.36 µB from the susceptibility curve. Change in maximum magnetic entropy ǀ∆S Max ǀ, determined from magnetic isotherms, is approximately 4.14 Jkg−1 K−1 at 65 K under 5 T applied field, leading to higher relative cooling power, RCP as 200.29 Jkg−1. Specific heat capacity, ∆Cp, and temperature-averaged entropy change, TEC, were also analyzed to study magnetic cooling efficiency. This study observed that FeMnO3 displays potential MCE performance, making it a promising candidate for magnetic refrigeration applications. Graphical abstract

Magnetoelectric properties and Morin type spin transitions of Na-doped GaFeO3

The effects of Na doping on the structure magnetic, electric, and magnetoelectric properties of GaFeO3were studied. Rietveld refinement of the XRD data reveals the formation of a single-phase trigonal structure with no impurity on Na doping up to 50% and a significant increase in lattice strain with doping. FTIR and Raman analysis further supported the phase purity of the samples. The morphology of the samples was studied using FESEM, and the particle size increased with Na doping. Magnetic data shows room temperature ferrimagnetic properties. Temperature-dependent magnetization measurements revealed a noticeable change from GaFeO3, exhibiting a Morin-like transition at 182 K for the lowest Na content. This AFM transition temperature increased to 217 K with the highest Na doping levels. The temperature-dependent Raman spectra do not reveal any structural phase transition and show a distinct change in phonon modes near the spin reorientation temperature. The leakage current density of the samples at 100 volts increased from 10-8A cm-2to (10-4-10-5A cm-2) with Na doping. The frequency-dependent dielectric constant increased largely with doping. The magnetoelectric coupling coefficient measured at room temperature rises forx= 0.05 to (36.2 ps m-1) and slowly decreases as Na concentration increases.

Random-anisotropy effects in the second-order phase transition of the 2D Blume-Capel model

We report on the second-order phase transition of two-dimensional (2D) magnetic materials under the influence of random anisotropy in the context of the Blume-Capel model employing an effective field theory and the differential operator method. By analyzing the temperature dependence of magnetization, we thoroughly explore the second-order ferromagnetic-to-paramagnetic (FM-PM) phase transition at the critical temperature $T_C$. When the magnitude of the random anisotropy $D$ and its probability $p$ is sufficiently large, the magnetization equation becomes divergent and unsolvable at a critical temperature, indicating the emergence of a tricritical point and a first-order phase transition. Additionally, we produce a phase diagram for the second-order phase transition presenting the relation between the critical temperature and anisotropy amplitude at various probabilities.

Coexistence of room temperature magneto-chiral dichroism and magneto-electric coupling in a chiral nanomagnet.

We report herein on the magneto-chiral dichroism (MChD), investigated through near infrared light absorption, of a chiral nanomagnet showing room temperature magneto-electric coupling. The MChD signal associated with the YbIII center is driven by the magnetic dipole allowed character of the 2F7/2 ← 2F5/2 electronic transition (|ΔJ| = 1). Magnetic field and temperature dependence studies reveal an MChD signal that follows the material magnetization and persists at room temperature. These results represent the first evidence of the coexistence of magneto-chiral dichroism and magneto-electric coupling at room temperature in a molecular nanomagnet and pave the way for further studies where magneto-chiral anisotropy and magneto-electric coupling interact.

Charge order and multi-order magnetic phase transitions in La1-x-yCaxKyMnO3 with modulated superstructure

The stable induction of symmetry breaking through structural design is fundamentally crucial to explore unprecedented physical properties of strongly correlated oxides. However, it is challenging to achieve structural modulation and symmetry alteration using simple methods. Herein, we investigated the A-site binary doping in LaMnO3 perovskite system to achieve controlled modulation and explored its magnetic properties. La0.67Ca0.22K0.10MnO3 with modulated structures underwent a second-order magnetic transition which was clearly exhibited by the competition between ferromagnetism (FM) and antiferromagnetism (AFM). The evident doping-content-sensitive ferrimagnetic charge order behavior was also associated observed. It was illustrated as two ferrimagnetic transitions (TC1= 299K and TC2= 286K) and an evident charge order peak (TCO= 237K) in the temperature-dependent magnetization curve. The chemical ordering induced by the A-site ternary doping is also reflected in the magnetocaloric measurements, showing a reduction in the maximum magnetic entropy change. The above results indicate that the arrangement of the A-site ternary elements in perovskite manganese oxides (La1-x-yCaxKyMnO3) exhibits more complex and diverse magnetic transitions, and significantly enhances the charge order behavior compared to binary element arrangements (such as La0.5Ca0.5MnO3 whose order behavior is dominated by Mn³⁺ and Mn⁴⁺ permutations on the B site).

Coexistence of altermagnetism and robust ferroelectricity in a bulk MnO wurtzite structure.

Altermagnetism is a new class of material with zero net magnetization, but having a nonrelativistic spin-split band structure. Here, we investigate the multifunctional properties of the hexagonal wurtzite MnO (w-MnO). w-MnO has a direct band gap of 0.39 eV and the altermagnetic behavior is achieved with a spin splitting of up to 188 meV. The bulk w-MnO has an in-plane magnetic anisotropy energy of -0.17 meV per cell along the [100] direction and temperature-dependent magnetization reveals a Néel temperature of around 180 K. Moreover, a maximum spin Hall conductivity of -285(ℏ/e) S cm-1 is obtained at a chemical potential of -0.24 eV. Along with the altermagnetism, we also find a large out-of-plane spontaneous polarization of 76.25 μC cm-2. w-MnO exhibits a low energy barrier of 0.26 eV per formula unit (f.u.) for polarization switching and this is further decreased to 0.15 eV per f.u. under 5% epitaxial tensile strain. The molecular dynamics simulations suggest that w-MnO retains its ferroelectric order below 2100 K indicating excellent thermal stability. These findings suggest that the hexagonal w-MnO can be a promising candidate for multiferroic applications particularly in spintronic and ferroelectric devices with high thermal stability.

Huge effects of hydrogen absorption on the magnetic properties of ScFe2

The effects of both hydrogen and deuterium absorption are investigated in the ScFe2 intermetallic compound by comparing its intrinsic magnetic properties with those of ScFe2H2.8 and ScFe2D3.2 compounds. It is found that H/D insertion into the hexagonal MgZn2-type crystal lattice of ScFe2 induces a huge increase in spontaneous magnetization, attributed to the volume expansion caused by H/D insertion. The increase in spontaneous magnetization amounts to 104% for ScFe2D3.2. We report for the first time the Curie point of the hydride and deuteride compounds from the analysis of the temperature dependence of the spontaneous magnetization in the frame of Kuz'min's model. Unlike spontaneous magnetization, the magnetic ordering temperature remains almost unaltered upon H insertion for the studied compositions. The ferromagnetic state is robust for all the studied compounds, none of which present antiferromagnetic behavior. No significant difference is observed in the magnetic properties for the two H/D isotopes, the dominant factor being the H/D concentration.

Quantum spin-liquid in Ba3CuSb2O9 epitaxial thin films

Hexagonal perovskite materials are emerging quantum spin liquid (QSL) systems providing a fertile ground to realize novel quantum phenomena. The epitaxially grown thin films of such materials offer a compelling approach to utilize exotic quantum phases for device applications with better control over the structure. We fabricate the intriguing QSL triple perovskite Ba3CuSb2O9epitaxially onto a MgO (100) substrate by pulsed laser deposition technique as well as in bulk form for comparison. The presence of only (00l) parallel planes of Ba3CuSb2O9in x-ray diffraction validates the epitaxial growth of the thin film. Temperature-dependent magnetization of thin film reveals no magnetic ordering down to 400 mK, with a large antiferromagnetic Curie-Weiss temperature (θCW≈-11.68 K). This indicates strong magnetic frustration and QSL behaviour, similar to bulk Ba3CuSb2O9. The presence of magnetic correlations at low temperature (in the quantum spin liquid state) is further confirmed by analysing the low temperature magnetic isotherms. These experimental findings underscore the potential of this quantum material for its use in quantum technologies.

Magnetic and Biomedical Properties of Iron Nanoparticles Synthesized Using Vitex agnus-castus Extract.

Magnetic nanoparticles have attracted significant attention in nanoscience and nanotechnology due to their unique physicochemical properties. These properties enable their great potential in various biomedical applications, such as hyperthermia, drug delivery, tissue engineering, theranostics, and lab-on-a-chip technologies. Physical and chemical methods are conventionally used for the synthesis of nanoparticles; however, due to several limitations of these methods, research focus has recently shifted towards developing clean and eco-friendly synthesis protocols while maintaining their desirable chemical and physical properties. In this study, iron oxide nanoparticles (FeNPs) were synthesized for the first time using the green synthesis method with extracts from Vitex agnus-castus. The structural and magnetic characterization of FeNPs was carried out using state-of-the-art techniques. The formation of FeNPs was confirmed by UV-vis spectroscopy. The morphology and size distribution were examined by a zetasizer and SEM, which showed agglomerated ring-shaped structures with a moderate size distribution among the nanoparticles. The crystalline structure and phase purity of the FeNPs were analyzed by XRD. FT-IR spectroscopy confirmed the attachment of bioactive plant molecules on the FeNP surfaces. The TGA results indicated the presence of organic molecules on the surface of the nanoparticles. Further studies including temperature-dependent magnetization and coercivity measurements were performed by PPMS and ESR, confirming the soft magnetic characteristics of synthesized FeNPs. Additionally, the dose-dependent toxicity and anti-cancerogenic effects of the FeNPs were screened towards the glioma cancer line (C6) and fibroblast cell line (L929) in vitro using an MTT assay. After 24 h of treatment, inhibitory concentration IC50 values of 26.51 µg/mL (l929) and 10.73 µg/mL (C6) were determined, respectively. These results suggest the potential of the synthesized FeNPs in developing new biocompatible systems for diagnostic and therapeutic purposes. This study contributes to the growing demand for research in nanotechnology by offering a sustainable and effective green synthesis method for FeNPs, expanding their potential applications in nanomedicine.

Spin glass behavior of single-crystalline ErFe2O4−δ

Abstract We investigated magnetic properties of ErFe2O4-δ single crystal containing oxygen vacancies with value of δ being estimated to be 0.066. The temperature dependence of dc magnetization in zero field cooling (ZFC) process reveals that ErFe2O4-δ undergoes a ferrimagnetic transition at 234 K followed by a broad peak at 224.3 K. The latter is attributable to the spin glass transition as indicated by the strong frequency dependence of temperature-dependent ac susceptibility. The frequency variation of transition temperature is described well by the dynamic scaling law and the critical exponent is similar to those reported for typical spin glasses. Additionally, the spin glass transition at 224.3 K is confirmed by the fact that the magnetic field dependence of irreversible transition temperature is coincident with the de Almeida-Thouless line and that the aging memory and rejuvenation effect is observed. Noticeably, ErFe2O4-δ single crystal exhibits the field-cooled hysteresis loop shift and training effect below 200 K, suggesting the occurrence of exchange bias effect originating from the spin glass phase.

Magnetic behavior of nanofilms prepared by assembling different Co ferrite nanoparticles

We study the magnetic characteristics of nanofilms composed of CoFe2O4 nanoparticles synthesized by thermal decomposition (TD) and self-combustion (SC) methods, assembled on glass substrates using the Langmuir-Blodgett technique. Despite both synthesis methods render crystalline Co ferrite nanoparticles, the differences in particle size and saturation magnetization are notable; however, both nanofilms reveal a ferrimagnetic behavior and display a significant surface contribution to the net magnetization at temperatures below 50 K. This effect is attributed to the nanoparticles' surface spins misaligning with the spins of the ordered core and freezing into a disordered structure. Effective anisotropy Keff values were determined, obtaining similar values to the bulk material (Keff ∼2 × 105J/m3) for the nanofilm made of TD nanoparticles, while the nanofilm prepared with SC nanoparticles presents an enhanced value (Keff=5 × 105J/m3). The temperature-dependent saturation magnetization curves were fitted with the modified Bloch's law and an additional term that corresponds to the frozen spins.

Multivalent cation substitution boosted sodium-ion storage in NASICON-type iron-phospho-sulphate cathodes

Despite advancements in NASICON cathodes, their widespread use in sodium-ion batteries (NIBs) remains limited due to low energy density, durability issues, and the use of scarce transition metals like vanadium. While the NASICON-type NaFe2(PO4)(SO4)2 cathode shows potential in addressing these challenges, it encounters issues with electron transport and Na+ diffusion. To overcome these hurdles, we introduce a novel Al3+-substituted NaFe2(PO4)(SO4)2 (NFAPS) cathode in this study, synthesised by a straightforward solid-state ball-milling method. Herein, Al3+ is strategically incorporated at the Fe site, and MWCNT is added in situ during NFAPS synthesis. The doping reduces the band gap, improves charge mobility, and maintains structural integrity during the Na+ insertion and extraction processes. Further, Al3+ enhances the spin state of Fe by attenuating the energy gap of undoped NFAPS cathodes, resulting in improved electrochemical performance, as evidenced by temperature-dependent magnetization susceptibility (M−T) and electron paramagnetic resonance (EPR) measurements. The optimized cathode, NaFe1.93Al0.07(PO4)(SO4)2 (NFAPS07) delivered a high specific discharge capacity of 124 mAh/g at C/20 (1C = 127 mAh/g), impressive rate capability (93.49 mAh/g at C/5 and 78.85 mAh/g at C/2) and good cycle life even at higher current rates. Ex-situ XRD analysis of NFAPS electrodes at various (de)sodiation voltages shows negligible volume expansion with minimal structural distortion. Further, NFAPS07 exhibits the highest reported energy density of 372 Wh kg−1 among all NASICON-based NaFe2(PO4)(SO4)2 cathode. Both experimental and first-principles studies confirm that enhanced charge migration, electrical conductivity, and lower activation barrier stem from synergistic effects of optimised Al3+ doping in NFAPS. Such multivalent cation-doped NASICONs can be adapted to economically design next-generation high-energy–density NIB.

Study on High-Voltage Cathode Li-Ni-Mn Spinel Oxides with Low-Temperature Magnetism

Lithium-ion rechargeable batteries have been attracting researcher’s interest, because they are candidate to address environmental issues, especially for application to electric vehicles and stationary energy storage systems. The battery operating voltage is one of the factor affecting the energy density of battery cell, and therefore positive electrode with high operating voltage is very attracting. A typical high-voltage cathode material, LiNi0.5Mn1.5O4 is an end member of LiNixMn2-xO4 solid solution compounds (0.00<x<0.50). From the previous study, it is known that LiNi0.5Mn1.5O4 spinel is a ferri-magnetic material with large magnetic moment and high transition temperature. In this work, the compounds of LiNixMn2-xO4 (0.40<x<0.50) are studied with both low-temperature magnetism and electrochemical charge-discharging. Additionally, the correlation between electrochemical and magnetic properties is also discussed.LiNixMn2-xO4 (0.40<x<0.50) were prepared by gelation of nitrate/citrate solution, thermal decomposition at 500 ℃ and annealing under various conditions (temperature and atmosphere). Under the preparation condition at relatively low temperature (700 ℃) in oxygen atmosphere, they were single phase of cubic spinel with fine particles. The lattice parameters monotonously decreased, as x increased. The charge-discharge profiles have twin plateaus around 4.7 V, to Ni2+/Ni3+ and Ni3+/Ni4+ redox signals, with a small signal at ~4.0 V. The capacity at >4.5 V formers increased with x and that at <4.5 V was reduced. From the magnetic evaluation, the saturation magnetization at 2 K (Ms) increased with x, and simultaneously, the ferri-magnetic/paramagnetic transition temperature (Tc), evaluated from temperature dependence of the saturation magnetization, shifted higher. These results exhibited the following relation-ships (presented in Fig. 1); the capacity at >4.5 V was almost proportional to Ms, and the operating voltage was proportional to Tc. However, it was found that the magnetic response under weak magnetic field was not usual (shown in Fig. 2) and it implied two-step phase transition around Tc. The anomaly was thought to be attributed to magnetic in-homogeneity, which is very sensitive to the specimen characters. The analysis of experimental results of specimens prepared under different conditions are being carried out and then presented and discussed at the conference. Figure 1

Separate magnetic and structural phase transitions in Mn50−xFexRh50 films grown on MgO

Abstract Investigations of the magnetic and structural characteristics of Mn50−x Fe x Rh50 alloys are important due to their notable phase transition behavior. In this study, a series of highly ordered epitaxial films with varying Fe concentrations are grown on MgO (001) substrate. At low Fe concentrations (x = 0, 2, 6), a separation between the structural phase transition and the magnetic phase transition is observed. Unlike structural phase transitions, temperature-dependent magnetization exhibits fairly large temperature hysteresis. In addition, the structural transition induces further tetragonal distortion, resulting in an intermediate phase between the B2 and L10 structures. This separated magnetic and structural phase transitions have been further validated through x-ray diffraction, anisotropic magnetoresistance and spin-pumping measurements. Moreover, as the Fe concentration is increased, the Mn50−x Fe x Rh50 films exhibit ferromagnetic behavior due to competitive magnetic exchange interactions, while the structural phase transition is suppressed.

Coexistence of Superconductivity and Magnetic Ordering in the In-Ag Alloy Under Nanoconfinement.

The impact of the interface phenomena on the properties of nanostructured materials is the focus of modern physics. We studied the magnetic properties of the nanostructured In-Ag alloy confined within a porous glass. The alloy composition was close to the eutectic point in the indium-rich range of the phase diagram. Temperature dependences of DC magnetization evidenced two superconducting transitions at 4.05 and 3.38 K. The magnetization isotherms demonstrated the superposition of two hysteresis loops with low and high critical fields below the second transition, a single hysteresis between the transitions and ferromagnetism with weak remanence in the normal state of the alloy. The shape of the loop seen below the second transition, which closes at a low magnetic field, corresponded to the intermediate state of the type-I superconductor. It was ascribed to strongly linked indium segregates. The loop observed below the first transition is referred to as type-II superconductivity. The secondary and tertiary magnetization branches measured at decreasing and increasing fields were shifted relative to each other, revealing the proximity of superconducting and ferromagnetic phases at the nanometer scale. This phenomenon was observed for the first time in the alloy, whose components were not magnetic in bulk. The sign of the shift shows the dominant role of the stray fields of ferromagnetic regions. Ferromagnetism was suggested to emerge at the interface between the In and AgIn2 segregates.

Enhancement of superconducting properties of grown FeTe0.65Se0.35 single crystals through air annealing

Abstract This work investigates the annealing effects on the superconducting properties of FeTe0.65Se0.35 single crystals. We examine the impact of varying annealing times on the magnetotransport, magnetic, and vortex pinning properties of the single crystals. The structural analysis shows the single crystalline growth of crystals along the c-axis. X-ray photoelectron spectroscopy results confirm the presence of iron oxides in the annealed samples. Temperature-dependent resistivity and magnetization measurements confirm the superconductivity in the as-grown and annealed samples. However, the as-grown sample shows a broad superconducting transition and low superconducting volume fraction, but after annealing, significant improvement in both is observed. Moreover, the self-field critical current density at 2 K is enhanced by a factor of ~4.5 for the optimally annealed sample compared to the as-grown sample. Experimental observations have been analyzed with the theoretical models to understand the effects of annealing on the vortex pinning mechanisms. Further, the specific heat study confirms the bulk superconductivity in the annealed sample compared to the as-grown single crystal. Overall, our study indicates that the superconducting properties vary with the annealing time, and the best results are obtained at an optimum annealing time.

Comprehensive approach on La1-xPbxMnO3 (0.2 ≤ x ≤ 0.5) perovskites synthesized by solid state reaction technique

We have synthesized Pb concentrated La manganites La1-xPbxMnO3 (0.2 ≤ x ≤ 0.5) using solid state reaction route to investigate several physical properties such as structural, thermal, magnetic, electronic and elastic properties via both the experimental characterizations and the first principles calculations under the framework of density functional theory (DFT). The structures of the studied perovskites are examined by X-ray diffraction (XRD) pattern and also compared with the crystallographic data obtained by computations. The crystallization and formation of the studied phase of manganites are confirmed by analyzing the thermogravimetric (TG) curve. The temperature dependence of magnetization of all the samples exhibits a ferromagnetic metal phase with the Curie temperatures TC ranging from 334 to 338 K. Although a metal-semiconductor transition is expected at around TC for the measurement of electrical resistivity with temperature but we observe semiconducting behavior because of the resistivity data started from room temperature. The calculated energy dispersion of all the manganites shows metallic conduction in conformity with the available experimental results. All the studied perovskites under investigation possess mechanical stability, malleability as well as anisotropy. The calculated Debye temperatures of all the Pb-doped La manganites show excellent correspondence with the other thermophysical parameters like melting point, phonon thermal conductivity and hardness as well.

Correlation Between the Crystal Structure and Magnetic Properties of Bi1−yCayFe1−xMnxO3 Multiferroics near the Polar-Anti(non)polar Phase Boundary

This paper reports the results of a systematic investigation into the magnetic properties of Bi1−yCayFe1−xMnxO3 (0.1 ≤ y ≤ 0.175, 0.35 ≤ x ≤ 0.45) solid solutions. The substitution of Bi3+ with Ca2+ and the concurrent introduction of Mn3+/Mn4+ ions result in the stabilization of various structural phases, with each exhibiting distinct magnetic characteristics. The investigation indicates that the samples containing the polar rhombohedral phase display metamagnetic transitions at low temperatures, characterized by pronounced jumps in magnetization. Single-phase samples with a nonpolar orthorhombic structure exhibit weak ferromagnetic behavior without metamagnetic features. The observed metamagnetic behavior, accompanied by anomalies in temperature-dependent magnetization and significant remnant magnetization at low temperatures, particularly in samples near the polar-anti(non)polar phase boundary, highlighted the presence of both antiferromagnetic and glassy magnetic components.

Tuning the structural, morphological, optical, dielectric, and magnetic properties of PVA via embedding with CoFe2O4:CuO nanoparticles

Polyvinyl alcohol (PVA) embedded CoFe2O4: CuO (CC) nanocomposites (NC) were prepared by casting technique. The prepared CoFe2O4 (CFO) sample have crystallite size in the range of 20.10–29.08 nm, whereas the crystallite sizes of CuO were found in the range of 20.29–23.68 nm, respectively. TEM images revealed the spherical shape morphology of CC nanocomposite with an average particle size distribution of 15 nm. The Urbach energy of the PCC films increased from 0.44 to 2.590 eV, whereas the direct optical band gaps decreased from 5.584 to 4.345 eV, respectively. The refractive indices of the PCC films were found to be in the range of 1.9–2.6, depending on the different models. Room Temperature-dependent saturation magnetization and coercive field for the prepared nanocomposites were found to be 0.52–1.296 (emu/g) and 1210–1340 (Oe), respectively. The uniaxial magnetic anisotropic constant of PCC films was remarkably enhanced from 0.654x103 to 3.826x103 (erg/cm3) for PCC2, PCC3, and PCC4, correspondingly. The enhanced values of dielectric and magnetic parameters of the prepared nanocomposites suggest their suitability for magnetic recording and memory systems.

Structure and Magnetic Properties of the n = 3 Ruddlesden-Popper Oxyfluoride La0.5Sr3.5Fe3O7.5F2.6.

Ruddlesden-Popper (RP) compounds of the general formula (AX)(ABX3)n with their unique sequence of perovskite-like (ABX3) and rock-salt-like units (AX) promise applications in diverse fields such as catalysis and superconductivity. Fluorination of RP oxides often leads to dramatic changes in the material properties, caused by differences in the atomic and electronic structure. While current research focuses on fluorination of n = 1 type RP oxides (A2BO4), n = 3 RP oxyfluorides have remained elusive. We present the synthesis of the first iron-based n = 3 RP oxyfluoride, La0.5Sr3.5Fe3O7.5F2.6, which was obtained from an oxide precursor by topochemical fluorination with poly(vinylidene fluoride). Joint Rietveld refinements of neutron and powder X-ray diffraction data were used to determine the crystal structure. Best results were obtained in the space group Pbca (No. 61) with a = 5.5374(1) Å, b = 5.5441(1) Å, and c = 29.2541(2) Å. The effect of the aliovalent incorporation of fluoride ions is particularly evident with respect to changes in structure and magnetic properties. The magnetic behavior was studied using field- and temperature-dependent magnetization measurements, Mößbauer spectroscopy, and neutron diffraction. Additional magnetic Bragg reflections observed in the room-temperature neutron data were successfully refined in the space group Pbca (61.1.497 in Opechowski-Guccione notation), indicating a G-type antiferromagnetic ordering with a surprisingly high Néel temperature above 300 K. This strong increase of TN by several hundred Kelvin compared to the parent oxide is particularly remarkable.