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Magnetic interactions and magnetocaloric effect in (La0.5Pr0.5)0.6Ba0.4MnO3: Effect of A-site co-doping

We report on the structural, magnetic, and magnetocaloric properties of polycrystalline (La0.5Pr0.5)0.6Ba0.4MnO3 (LPBMO), which was fabricated by a conventional solid-state reaction method. LPBMO undergoes a second-order paramagnetic to ferromagnetic (PM-FM) phase transition around a Curie temperature TC ~ 277 K. The maximum magnetic entropy change is ~ 3.22 J kg-1 K-1 for a magnetic field change of 5 T. Based on the modified-Arrott plot and the iterative Kouvel Fisher methods, a set of critical exponents (beta = 0.514, gamma = 1.164, and delta = 3.265) are determined. These values are close to those expected for the mean field model with long range interactions below TC and for the 3D-Ising model with short range interactions above TC. Effect of A-site co-doping (La,Pr) on the magnetic and magnetocaloric properties of LPBMO is analyzed and discussed.

preprint2019arXivOpen access
Nguyen Thi My DucChang-Ming HungNgo Thu HuongManh-Huong Phan
cond-mat.mtrl-sci
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Open access4 authors1 topic
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Nguyen Thi My DucChang-Ming HungNgo Thu HuongManh-Huong Phan

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