Spin-Glass Behavior and Magnetic Phase Diagram of La<sub>1-<i>x</i></sub>Sr<sub><i>x</i></sub>CoO<sub>3</sub>( 0 ≤<i>x</i>≤0.5) Studied by Magnetization Measurements
Masayuki Itoh(Chiba University), Ikuomi Natori(Chiba University), Satoshi Kubota(Saitama University), Kiyoichiro Motoya(Saitama University)
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Abstract
Magnetic properties of La 1- x Sr x CoO 3 (0 ≤ x ≤0.5) have been studied by magnetization measurements in low magnetic fields. It has been found that there exist spin-glass (0< x ≤0.18) and cluster-glass (0.18 ≤ x ≤0.5) regions. Ferromagnetic long-range order previously reported does not take place. Spin-glass behavior is ascribed to the frustration of random competing exchange interactions, namely the ferromagnetic double-exchange interaction between Co 3+ and Co 4+ and the antiferromagnetic one between like spins.
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