Magnetic and calorimetric investigations of inverse magnetocaloric effect in Pr0.46Sr0.54MnO3

Abstract

We investigated magnetic entropy change (ΔSm) in the A-type antiferromagnet Pr0.46Sr0.54MnO3 by magnetic and differential scanning calorimetry (DSC) methods. The field-induced antiferromagnetic to ferromagnetic transition is first-order in nature and is accompanied by a large change in the latent heat as evidenced by the DSC data. The ΔSm shows an inverse magnetocaloric effect (ΔSm=+9 J kg−1 K−1 for ΔH=7 T) around the Neel temperature (TN=210±2 K) by magnetic measurement, which closely agrees with the calorimetric results. It is suggested that the large positive ΔSm results from a field-induced structural transition that accompanies the destruction of antiferromagnetism.

Tuning of normal and inverse magnetocaloric effect in Sm0.35Pr0.15Sr0.5MnO3 phase separated manganites

“…Generally, a material shows IMCE if dM/ dT is positive. Antiferromagnets are expected to show the IMCE over a wide field range, as reported in Pr 1Àx Sr x MnO 3 (x = 0.5 and 0.54) compounds [7,30]. IMCE in FM manganite is rarely reported.…”

Investigation of magnetocaloric effect in La0.45Pr0.25Ca0.3MnO3 by magnetic, differential scanning calorimetry and thermal analysis

“…A first-order phase transition is accompanied by an abrupt volume change with or without a change in structural symmetry across the phase transition. Large MCE due to magneto-structural transition was discovered in intermetallic alloys such as Gd 5 Si 2 Ge 24 [1], NiMnGa [2], alloys and also in the antiferromagnetic manganite Pr 0.46 Sr 0.54 MnO 3 [3]. Materials like MnFeP 0.45 As 0.55 [4] and LaFe 13 À x Si x [5] which undergo magnetoelastic phase transition without any change in crystal symmetry also present high MCE values.…”

“…It is important to measure the magnetic entropy change by calorimetric method and compare with the value obtained from M-H isotherms. However, only a very few researchers have estimated magnetic entropy change from calorimetric measurements [3,15]. In this report, we study the magnetocaloric effect in La 0.45 Pr 0.25 Ca 0.3 MnO 3 by direct (calorimetry and thermal analysis of the sample) and indirect methods (magnetization isotherms).…”

Strain modulated large magnetocaloric effect in Sm0.55Sr0.45MnO3 epitaxial films

“…Antiferromagnets are expected to show the IMCE over a wide field range, as reported in Pr 1Àx Sr x MnO 3 (x ¼ 0.5 and 0.54) compounds. 29,30 IMCE in FM manganite is rarely reported. The possibility for observed IMCE is most likely due to the field induced AFM-FM transition.…”