Magnetic,magnetocaloric properties,and critical behavior in a layered perovskite La<Subscript>1.4</Subscript>(Sr<Subscript>0.95</Subscript>Ca<Subscript>0.05</Subscript>)<Subscript>1.6</Subscript>Mn<Subscript>2</Subscript>O<Subscript>7</Subscript>

We report the results of magnetic, magnetocaloric properties, and critical behavior investigation of the double-layered perovskite manganite La_1.4(Sr_0.95Ca_0.05)_1.6Mn₂O₇. The compounds exhibits a paramagnetic (PM) to ferromagnetic (FM) transition at the Curie temperature T _C = 248 K, a Neel transition at T _N = 180 K, and a spin glass behavior below 150 K. To probe the magnetic interactions responsible for the magnetic transitions, we performed a critical exponent analysis in the vicinity of the FM–PM transition range. Magnetic entropy change (??S _M) was estimated from isothermal magnetization data. The critical exponents β and γ, determined by analyzing the Arrott plots, are found to be T _C = 248 K, β = 0.594, γ = 1.048, and δ = 2.764. These values for the critical exponents are close to the mean-field values. In order to estimate the spontaneous magnetization M _S(T) at a given temperature, we use a process based on the analysis, in the mean-field theory, of the magnetic entropy change (??S _M) versus the magnetization data. An excellent agreement is found between the spontaneous magnetization determined from the entropy change [(??S _M) vs. M ²] and the classical extrapolation from the Arrott curves (µ₀H/M vs. M ²), thus confirming that the magnetic entropy is a valid approach to estimate the spontaneous magnetization in this system and in other compounds as well.     

Anisotropic and excellent magnetocaloric properties of La0.7Ca0.3MnO3 single crystal with anomalous magnetization

Magnetic properties and the magnetocaloric effect (MCE) have been investigated in La_0.7Ca_0.3MnO₃ single crystal with applied field along both the ab-plane and the c-direction. Due to the magnetocrystalline anisotropy, the crystal exhibits anisotropy in the MCE. Upon application of a 5 T field, the magnetic entropy changes (ΔS_M), reaching values of 7.668 J/(kg K) and 6.412 J/(kg K) for both the ab-plane and the c-direction, respectively. A magnetic entropy change of 3.3 J/(kg K) was achieved for a magnetic field change of 1.5 T at the Curie temperature, T_C = 245 K. Due to the absence of grains in the single crystal, the ΔS_M distribution here is much more uniform than for gadolinium (Gd) and other polycrystalline manganites, which is desirable for an Ericsson-cycle magnetic refrigerator. For a field change of 5 T, the relative cooling power, RCP, reached 358.17 J/kg, while the maximum adiabatic temperature change of 5.33 K and a magnetoresistance (MR) ratio of 507.88% at T_C were observed. We analysed the magnetization of La_0.7Ca_0.3MnO₃ single crystal at T_C and estimated several parameters of spin fluctuation on the basis of a self-consistent renormalization theory of spin fluctuations, with reciprocal susceptibility above T_C. We found that the magnetic property of La_0.7Ca_0.3MnO₃ is weakly itinerant ferromagnetic. A large reversible MCE and no hysteresis loss with a considerable value of refrigerant capacity indicate that La_0.7Ca_0.3MnO₃ single crystal is a potential candidate as a magnetic refrigerant.     

Magnetic State and Magnetocaloric Effect of SmMnO3

We present a study of magnetization and magnetocaloric effect for the SmMnO₃ compound. This compound was synthesized by combustion reaction and its magnetic and structural properties studied by X-ray powder diffraction (XRD) and magnetization (M) measurements as a function of temperature and under magnetic fields. The XRD pattern at room temperature confirmed the presence of a single phase with orthorhombic structure. From magnetization versus temperature, we observe two magnetic orderings, the first one at 6 K due to Sm³⁺, and the other one at T _N =57(2) K is the anti-ferromagnetic long-range ordering. The magnetic entropy change, ΔS _M , was obtained from magnetization isotherms close to T _N where it reaches a maximum value of about 8.0 J/kg K for an applied field of 7 T.     

Structural, Magnetic, and Magnetocaloric Properties of La0.5M0.1Sr0.4MnO3 (M=Bi, Eu, Gd, and Dy) Perovskite Manganites

Structural, magnetic, and magnetocaloric properties of La_0.5M_0.1Sr_0.4MnO₃ (M=Bi, Eu, Gd, and Dy) powder samples, synthesized using the solid-state reaction at high temperature, have been experimentally investigated. X-ray diffraction analysis using the Rietveld refinement show that La_0.5Bi_0.1Sr_0.4MnO₃ sample is single phase and crystallizes in the rhombohedral system with $R\overline{3}c$ space group whereas a mixture of orthorhombic (Pbnm) and rhombohedral ( $R\overline{3}c$ ) phases is observed for M=Eu, Gd, and Dy compounds. The Curie temperature, T _C , shifts to lower temperature with decreasing the average A-site ionic radius 〈r _A 〉, which is consistent with large cationic disorder. Arrott plots show that all our samples exhibit a second order magnetic phase transition. From the measured magnetization data of La_0.5M_0.1Sr_0.4MnO₃ (M=Bi, Eu, Gd, and Dy) samples as a function of magnetic applied field, the associated magnetic entropy change |ΔS _M | has been determined. In the vicinity of T _C , |ΔS _M | reached, in a magnetic applied field of 1 T, maximum values of 0.98 J/kg?K, 1.01 J/kg?K, 0.81 J/kg?K, and 0.77 J/kg?K for M=Bi, Eu, Gd, and Dy, respectively.     

Low Temperature Giant Magnetocaloric Effect and Critical Behavior in Amorphous Co100−xEr x (x = 55, 65) Alloys

We report on the magnetic properties, magnetocaloric effect (MCE) and critical exponents in amorphous Co_100?xEr _x (x = 55 and 65), prepared by liquid quenching technique. The transition temperature from ferromagnetic to paramagnetic state has been evaluated according to M(T) measurements, and it is found to be 26 and 15 K for Co₄₅Er₅₅ and Co₃₅Er₆₅, respectively. The magnetization dependence M(H, T) on the temperature T and magnetic field H was measured carefully in the critical region. Magnetic entropy change (– ΔS _M ) allowing estimation of the MCE was determined based on thermodynamic Maxwell’s relation. The magnetocaloric study exposes a quite large value of the magnetic entropy change, which decreases when increasing Er concentration. For an applied magnetic field of 5 T,the values of (– ΔS _Max) peak are about 10.8 and 9.8 J kg ^?1 K ^?1 for Co₄₅Er₅₅ and Co₃₅Er₆₅, respectively. From the field dependence of the magnetic entropy ΔS _M (ΔS _M α H ⁿ ) and the relative cooling power (RCP) (RCP α H ^1+1/δ), it was possible to evaluate the critical exponents of the magnetic phase transitions. Their values are in good agreement with those obtained from the critical exponents using a modified Arrott method.     

Magnetic Properties and MCE in Heusler-Type Glass-Coated Microwires

We prepared Heusler-type Ni–Mn–Ga glass-coated microwires with total diameters, D, from 16 until 65 μm consisted of a metallic nucleus with diameters, d, between 10 and 31 μm and surrounded by the glass coating by the Taylor–Ulitovsky technique and measured the magnetocaloric effect, MCE, by the recently introduced precise method allowing the detection of a change in the temperature, ΔT, with an accuracy of below 10^?3 K. As-prepared microwires did not show ferromagnetic ordering at least near room temperature. Annealing above 773 K even for few minutes results in drastic change of magnetic properties: annealed sample show magnetization versus temperature dependence typical for ferromagnetic behavior with the Curie temperature about 315 K. Analysis of the X-ray diffraction allows us to identify presence of cubic phase in as-prepared state with the space group Fm3m and some amount of the tetragonal phase with space group I4/mmm. We measured directly the MCE, ΔT, in annealed samples. Before glass removal, we observed ΔT≈0.06 K for sample 1 and 0.08 K for sample 2. After glass removal of sample 1, ΔT increased until 0.22 K. Observed MCE is associated with magnetic (paramagnetic–ferromagnetic) and probably structural (austenite–martensite) phase transitions. Temperatures of the peak values of MCE were found to be of ～318 K and ～309 K, respectively Use of the glass-coating fabrication technique allows fabrication of composite thin wires from the brittle Ni–Mn–Ga alloy that cannot be cold-drawn to create fibers by conventional methods.     

Glassy Behavior of La0.8Ca0.2MnO3 Nanoparticles

Magnetic and transport properties of La_0.8Ca_0.2MnO₃ nanoparticles with average size of 18 nm and Curie temperature T _C??231 K have been studied. Pronounced irreversibility of magnetization below T _irr??208 K has been observed. Studied particles have shown memory effects in zero-field-cooled and field-cooled magnetization. The resistivity has a semiconducting character at 150<T<300 K and exhibits relaxation and memory effects below the Curie temperature. The results suggest that superspin-glass features in ensembles of interacting 18 nm La_0.8Ca_0.2MnO₃ particles appear along with superferromagnetic-like features.     

Above room temperature magnetocaloric effect in perovskite Pr0.6Sr0.4MnO3

The dependence of magnetization M on the applied magnetic field H and temperature T was measured carefully, near the Curie temperature T_C for the perovskite manganite sample Pr_0.6Sr_0.4MnO₃. The experimental results indicate that this specimen exhibit ferromagnetic (FM) to paramagnetic (PM) transition at T_C ~ 320 K. In the 200 K–45 K temperature range the spontaneous magnetization was decreasing, probably due to spin canted state between manganese and praseodymium spin systems. At 46 K the magnetization presents a second little transition, which can be ascribed to very weak traces of secondary Mn₃O₄ phase, and remains constant between 10 K and 46 K. The maximum value of the magnetic entropy change obtained from the M(H) plot data is |ΔS_M^max| = 2.3 Jkg^? 1 K^? 1 for applied magnetic field of 2.5 T. At this value of magnetic field the relative cooling power (RCP) is 34.5 Jkg^? 1. The temperature corresponding to ΔS_M maximum value is almost equal to T_C. The large entropy change can be attributed to the fact that the ferromagnetic transition enhances the effect of the applied magnetic field greatly. It is suggested by the results that this compound can be used as the working material in an active magnetic regenerative refrigerator above room temperature.     

Pressure-enhanced ferromagnetism and metallicity in La1.24Sr1.76Mn2O7 bilayered manganite system

We report the low temperature magnetization, electrical resistance, and magnetoresistance of La_1.24Sr_1.76Mn₂O₇ bilayer manganite system under hydrostatic pressure. At ambient pressure, the compound shows a sharp ferromagnetic transition (T _C) accompanied by a metal–insulator transition (T _MI) at 130 K. We observe that the T _C and T _MI increase with hydrostatic pressure at a rate of dT _C/dP = 2.08 K/kbar and dT _MI/dP = 2 K/kbar, respectively. Also, we observe an appreciable increase of magnetic moments at low temperatures with increasing pressure. The high temperature regime of temperature dependence of resistivity curves was fitted with the Emin–Holstein’s polaron hopping model and the calculated activation energy values suggest that the applied pressure weakens the formation of Jahn–Teller polarons. The magnetoresistance ratio (MRR) was measured at T _C and at 4.2 K upon an external magnetic field of 5 T. The observed MRR at T _C is about 210 % and the applied pressure increases the MRR significantly. These results can be interpreted by the pressure-enhanced overlap between the orbitals of Mn–O–Mn, which facilitates the charge transfer and hence enhances the ferromagnetism and metallicity.     

Theoretical Work in Magnetocaloric Effect of LaFe13−xSi x Compounds

In this paper, the magnetocaloric effect (MCE) of LaFe_13?xSi _x compounds with 1.2 ≤ x ≤ 2.2 has been investigated. For this purpose, the magnetization dependence on the temperature and magnetic field were measured. Magnetic entropy change (?ΔS_M) allowing estimation of the MCE was determined based on thermodynamic Maxwell’s relation. The experimental results show that T_C increases with the Si content, whereas the magnetic entropy variation decreases. A large magnetic entropy change has been observed. The maximum \((-\Delta \mathrm {S}_{\mathrm {M}}^{\text {max}})\) of LaFe_10.8Si_2.2 occurring close to T_C = 240 K is about 2.3 Jkg^?1 K^?1 for an applied field change of 0–2 T. In addition, a magnetocaloric effect of LaFe_13?xSi _x compounds (x = 1.2 and 1.6) has been also carried out using phenomenological model. Dependence of the magnetization on temperature variation for LaFe_13?xSi _x compounds (x = 1.2 and 1.6) in different applied magnetic fields was simulated. The values of maximum entropy change, full width at half maximum, and relative cooling power (RCP) for the LaFe_11.8Si_1.2 and LaFe_11.4Si_1.6 compounds in different applied magnetic fields were calculated.     

Magnetocaloric Effect in LaFe10.7Co0.8Si1.5 Compound Near Room Temperature

Magnetocaloric properties of LaFe_10.7Co_0.8Si_1.5 with the cubic NaZn₁₃-type structure were investigated around their Curie temperature T _C . By the help of the phenomenological model, the magnetization curves for LaFe_10.7Co_0.8Si_1.5 at several magnetic fields were simulated. The magnetic entropy change and specific heat are obtained. The values of maximum magnetic entropy change, full-width at half-maximum, and relative cooling power, at several magnetic field variation, were calculated. It is shown that for LaFe_10.7Co_0.8Si_1.5 the magnetic entropy change follows an asymmetrical broadening of ΔS _M peak with increasing field. The maximum magnetic entropy change of this compound is 7.10 JK^?1?kg^?1 and relative cooling power is 201.37 J/K under a magnetic field of 2 T. The magnetocaloric effect of this material is large and tunable, suggesting a possible technical application of the material at moderate magnetic fields near room temperature.     

Phase Transition and Anomalous Low Temperature Ferromagnetic Phase in Pr0.6Sr0.4MnO3 Single Crystals

We report on the magnetic and electrical properties of Pr_0.6Sr_0.4MnO₃ single crystals. This compound undergoes a continuous paramagnetic-ferromagnetic transition with a Curie temperature T _C∼301 K and a first-order structural transition at T _S∼64 K. At T _S, the magnetic susceptibility exhibits an abrupt jump, and a corresponding small hump is seen in the resistivity. The critical behavior of the static magnetization and the temperature dependence of the resistivity are consistent with the behavior expected for a nearly isotropic ferromagnet with short-range exchange belonging to the Heisenberg universality class. The magnetization (M–H) curves below T _S are anomalous in that the virgin curve lies outside the subsequent M–H loops. The hysteretic structural transition at T _S as well as the irreversible magnetization processes below T _S can be explained by phase separation between a high-temperature orthorhombic and a low-temperature monoclinic ferromagnetic phase.     

Transport,magnetic and structural properties of Mott insulator MnV2O4 at the boundary between localized and itinerant electron limit

The effect of Zn and Cr doping on the transport and magnetic properties of MnV₂O₄ have been investigated using resistivity, thermoelectric power (TEP), magnetization, neutron diffraction and X-ray diffraction techniques. It is observed, that with increase in Zn substitution the non-collinear orientation of Mn spins with the V spins decreases which effectively leads to the decrease of structural transition temperature more rapidly than Curie temperature. Investigations also show that with Zn doping both the Curie temperature (T _C) and structural transition temperature (T _S) decrease, while the gap between them increases rapidly. On the other hand, with Cr doping on the V site the T _C remains almost constant but T _S decreases rapidly. Moreover, with Zn doping both resistivity and TEP decrease, whereas with 10 % Cr doping the TEP decreases and a change of sign occurs indicating an increase in the band gap. This leads to the decrease of the mobility of the polaronic holes than the mobility of the electronic polarons at low temperature.     

Revisiting Heat Capacity of Bulk Polycrystalline YBa2Cu3O7−δ

In this letter, we present the superconducting property characterization of a phase pure, reasonably good quality YBa₂Cu₃O_7?δ sample. Studied compound is crystallized in orthorhombic Pmmm space group with lattice parameters a, b, and c being 3.829(2), 3.887(1) and 11.666(3) Å, respectively. Bulk superconductivity is observed below 90 K as evidenced by resistivity and dc/ac magnetization measurements. The resistivity under magnetic field (ρTH) measurements showed clearly both the intra-grain and inter-grain transitions, which are supplemented by detailed (of varying frequency and amplitude) ac susceptibility studies as well. The upper critical field at 0 K, i.e. H _c2(0) being determined from ρTH measurements with 50 % criteria of resistivity drop, is ～70 T. Studied polycrystalline YBa₂Cu₃O_7?δ is subjected to detailed heat capacity (C _P ) studies. C _P exhibited well-defined anomaly at below 90 K, which decreases with applied field. Although the C _P anomaly/peak at T _c reduces with applied field, the same is not completely suppressed in high applied fields of up to 12 T. The Sommerfeld constant (γ) and Debye temperature (Θ _D), as determined from low temperature fitting of C _P (T) data to Sommerfeld–Debye model, are 10.65 mJ/mole-K² and 312.3 K, respectively. The results are compared with existing literature on bulk polycrystalline superconducting YBa₂Cu₃O_7?δ sample.     

Effects of the Substitution of 30 % Pr for La on the Magnetic Properties and Magnetocaloric Effect in LaFe 1 1 . 5 Si 1 . 5 B 0 . 2

Magnetic properties and magnetocaloric effect (MCE) in LaFe_11.5Si_1.5 B _0.2 have been investigated by substituting 30 % Pr for La. It is found that the substitution of 30 % Pr for La leads to a reduction in Curie temperature (T _C) from 200 to 190 K. The characteristic of the itinerant electron metamagnetic (IEM) transition above T _C becomes more prominent with the substitution of 30 % Pr for La. The maximum magnetic entropy change (?ΔS _M) is remarkably enhanced from 13.0 to 17.9 J/kg·K under a field change of 0–3 T, and correspondingly, the values of refrigerant capacity (RC) for LaFe_11.5Si_1.5 B _0.2 and La_0.7Pr_0.3Fe_11.5Si_1.5 B _0.2 are 167 and 224 J/kg, respectively. The large ?ΔS _M and the high RC in a low magnetic field indicate that La_0.7Pr_0.3Fe_11.5Si_1.5 B _0.2 may be a promising candidate for magnetic refrigeration material near 200 K     

On the Magnetic Behavior of Polycrystalline Single-Phase YBaCo4O7+δ Obtained by Soft Chemical Synthesis

Polycrystalline single-phase YBaCo₄O_7+δ samples were synthesized by a wet chemistry method based on the so-called citrates route. The structural, morphological, and magnetic properties of the so-obtained samples were carefully studied by standard experimental techniques. The X-ray powder diffraction (XRD) patterns showed reflections of a pure hexagonal structure (space group P6₃mc) with lattice parameters being very close to those reported in the literature. No evidence of affectation by any secondary phase such as 112 (YBaCo₂O_5.5) was provided by XRD analysis. This finding was further corroborated by sensible SQUID magnetic measurements which showed signals stemming merely from the desired 114 phase (YBaCo₄O_7+δ ). A bifurcation in the zero field-cooled (ZFC) and FC magnetization curves below ～80 K was observed. The M _ZFC(T) curve displays a sharp peak at ～70 K and continues to be different down to the lowest temperature. In turn, the M _FC(T) curve shows a sharp rise at ～80 K and peaks at ～50 K. The conspicuous increase in the magnetization observed at ～80 K seems to be correlated with a transition into a long-range ordered antiferromagnetic state. This magnetic behavior is consistent with that observed in YBaCo₄O_7+δ single crystals. In turn, isothermal magnetization recorded at 70 K showed field-induced effects manifested itself in the appearance of a ferromagnetic component which could be originated by spin canting of the underlying antiferromagnetic state. The possible spin-glass behavior of the studied samples is ruled out through measurements of the real part of the AC susceptibility as a function of the frequency (8–473 Hz) on YBaCo₄O_7+δ single-crystals. Beyond this relevant result, the collected data demonstrate that the tested chemical route emerges as a suitable alternative to synthesize complex single-phase oxides such as the YBaCo₄O_7+δ cobaltate.     

Observance of Improved Magneto-resistance and Magnetic Entropy Change in La0.7(Ca0.2Sr0.1)MnO3:Pd Composite

Magneto-resistive and magneto-caloric properties of polycrystalline La_0.7(Ca_0.2Sr_0.1)MnO₃ (LCSMO) and La_0.7(Ca_0.2Sr_0.1)MnO₃:10 %PdO (LCSMO:Pd10) composites sintered at 1400 ^°C have been investigated. Rietveld refinement of their X-ray diffraction (XRD) patterns confirms the single-phase crystalline structure with orthorhombic Pbnm space group, showing no significant change in their lattice parameters with Pd addition. Disappearance of the low temperature resistivity hump in the Pd composite has been attributed to the suppression of the grain boundary effect and the conducting channels due to the presence of metallic Pd. While the Curie temperature T _c remained nearly unchanged, the peak value of the temperature coefficient of resistance (TCR) increased in the composite. $\mathit{TCR}_{\operatorname{MAX}}$ increased to 6.4 % (at 308 K) in the composite from 2 % (at 305 K) for the pristine LCSMO. Magneto-resistance (MR) and magnetic entropy change (ΔS _M ) also increased markedly in the composite material. This could be ascribed to the observed sharpness of both the magnetic and resistive transitions resulting from better grain connectivity. Maximum MR of 12.9 % (1 T) and 19.6 % (2 T) has been observed close to its T _c (309 K) in the pristine LCSMO. These values increased to 24.1 % (1 T) and 33.9 % (2 T) with the addition of PdO. The maximum values of |ΔS _M | are found to be 4.4, 8.2 and 11.7 J?kg^?1?K^?1 at field values of 1, 2 and 3 T, respectively, for LCSMO:Pd10 composite, which are far better than those reported for LCSMO:Ag10 composite.     

Field-Induced Transitions in RECo0.50Mn0.50O3 (RE = Dy, Eu)

We have studied the magnetization at high magnetic field for bulk ceramic samples of EuCo_0.50Mn_0.50O₃ and DyCo_0.50Mn_0.50O₃ at low temperature. For the Dy sample we can see two field transitions (near 2 T and 5 T) and the magnetization measured at 20 T (6.7 μ_B) is near the expected value (M _S =6.76 μ_B) if we consider a ferrimagnetic model of two sublattices fully aligned, one in opposition to the other. For the Eu sample we have five step transitions on the hysteresis curves (near 1; 3; 4; 5 and 6 T) and the measured magnetization at 20 T (2.6 μ_B) is lower than the expected value (M _S =3.87 μ_B), suggesting this is a case of Van Vleck magnetism. Nickel-containing samples of similar composition have been measured but no field-induced anomaly has been found.     

Synthesis and Superconductivity of New BiS2 Based Superconductor PrO0.5F0.5BiS2

We report synthesis and superconductivity at 3.7 K in PrO_0.5F_0.5BiS₂. The newly discovered material belongs to the layered sulfide based REO_0.5F_0.5BiS₂ compounds having a ZrCuSiAs-type structure. The bulk polycrystalline compound is synthesized by the vacuum encapsulation technique at 780 ^°C in a single step. Detailed structural analysis has shown that the as synthesized PrO_0.5F_0.5BiS₂ is crystallized in a tetragonal P4/nmm space group with lattice parameters a=4.015(5) Å, c=13.362(4) Å. Bulk superconductivity is observed in PrO_0.5F_0.5BiS₂ below 4 K from magnetic and transport measurements. Electrical transport measurements showed superconducting transition temperature (T _c ) onset at 3.7 K and T _c (ρ=0) at 3.1 K. The hump at T _c related to the superconducting transition is not observed in the heat capacity measurement and rather a Schottky-type anomaly is observed at below ～6 K. The compound is slightly semiconducting in a normal state. Isothermal magnetization (MH) exhibited typical type II behavior with a lower critical field (H _c1) of around 8 Oe.     

Investigation of Magnetic,Magnetocaloric, and Critical Properties of La<Subscript>0.5</Subscript>Ba<Subscript>0.5</Subscript>MnO<Subscript>3</Subscript> Manganite

We present an extensive study of the magnetic properties of a novel La_0.5Ba_0.5MnO₃ perovskite material prepared by the hydrothermal method. The explored sample was structurally studied by the x-ray diffraction (XRD) method which confirms the formation of a pure cubic phase of a perovskite structure with Pm3m space group. The magnetic properties were probed by employing temperature M (T) and external magnetic field M (μ_oH) dependence of magnetization measurements. A magnetic phase transition from ferromagnetic to paramagnetic phase occurs at 339 K in this sample. The maximum magnetic entropy change (\(\left | {{\Delta } S}_{M}^{\max } \right |\)) took a value of 1.4 J kg^??1 K^??1 at the applied magnetic field of 4.0 T for the explored sample and has also been found to occur at Curie temperature (T_C). This large entropy change might be instigated from the abrupt reduction of magnetization at T_C. The magnetocaloric effect (MCE) is maximum at T_C as represented by M (μ_oH) isotherms. The relative cooling power (RCP) is 243.2 J kg^??1 at μ_oH =?4.0 T. Moreover, the critical properties near T_C have been probed from magnetic data. The critical exponents δ, β, and γ with values 3.82, 0.42, and 1.2 are close to the values predicted by the 3D Ising model. Additionally, the authenticity of the critical exponents has been confirmed by the scaling equation of state and all data fall on two separate branches, one for T < T_C and the other for T > T_C, signifying that the critical exponents obtained in this work are accurate.