Electronic and magnetic properties and phase diagrams of (La_1–XR_X)_0.7Ca_0.3MnO₃ compounds with R ˭ Sm, Gd, Ho or Er

T. Terai Superconductivity Engineering Materials Research Laboratory, Graduate School of Engineering, University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan; Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan; Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka, 560-8531, Japan

T. Kakeshita Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan

T. Fukuda Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan

K. Kindo Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka, 560-8531, Japan

M. Honda Department of Physics, Faculty of Science, Naruto University of Education, Naruto, Tokushima, 772-8502, Japan

K. Kishio Superconductivity Engineering Materials Research Laboratory, Graduate School of Engineering, University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan

Abstract

Electronic and magnetic properties of the perovskite-like compounds of (La_1–xR_x)_0.7Ca_0.3MnO₃ (R ˭ Sm, Gd, Ho or Er; 0 ⩽ x ⩽ 1) have been studied by measuring electrical resistance and magnetization. Depending on x in all the compounds examined, a transition from a ferromagnetic metal to a paramagnetic insulator or to a spin-glass insulator state appears. These electronic and magnetic properties are found to depend not only on the tolerance factor t but also on the variance (second moment) [sgrave]² of the A-site ion radii distribution, and the phase diagram has been established by using t and [sgrave]² based on the results of the study and the results previously obtained by the present authors and many other researchers.

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Electronic and magnetic properties and phase diagrams of (La_1–XR_X)_0.7Ca_0.3MnO₃ compounds with R ˭ Sm, Gd, Ho or Er

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Electronic and magnetic properties and phase diagrams of (La1–XRX)0.7Ca0.3MnO3 compounds with R ˭ Sm, Gd, Ho or Er

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Electronic and magnetic properties and phase diagrams of (La_1–XR_X)_0.7Ca_0.3MnO₃ compounds with R ˭ Sm, Gd, Ho or Er