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

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arxiv 1912.03568 v1 pith:MCR7JIIK submitted 2019-12-07 cond-mat.mtrl-sci

Nguyen Thi My Duc , Chang-Ming Hung , Ngo Thu Huong , Manh-Huong Phan This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords magneticeffectinteractionslpbmomagnetocalorica-sitechangeco-doping
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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.

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