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Magnetic and transport properties of lanthanum perovskites with B-site half doping
Authors:Joonghoe Dho  N.H. Hur
Affiliation:a Department of Physics, Kyungpook National University, 1370 Sangyuk-dong, Book-gu, Daegu 702-701, South Korea
b Korea Center for CMR Materials, Korea Research Institute of Standards and Science, Yusong, P.O. Box 102, Taejon 305-600, South Korea
Abstract:We have synthesized various half doped lanthanum perovskites View the MathML source (BB′=MnV, MnCr, MnCo, MnNi, FeCr, FeMn, FeCo, FeNi) by solid state reaction method. The crystal structure was orthorhombic in all samples, but the magnetic and transport properties showed a large variation with the composition. A ferromagnetic feature was quite strong in the Mn-based perovskites but weak or non-existent in the Fe-based ones. The resistivity of Ni-doped ones was much smaller than those of the others. For all half doped perovskits, remarkably, the temperature dependent transport was well explained by variable range hopping model with different localization lengths.
Keywords:75.30.kz   75.25.+z
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