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- 저자 : T. C. Ozawa (검색결과 1 건)
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T. Ohnishi,S. Mizusaki,M. Naito,Y. Nagata,M. Itou,Y. Sakurai,T. C. Ozawa,Y. Noro,H. Samata 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The crystallographic, magnetic and transport properties of Sr1−xCaxRu0.5Mn0.5O3 were studiedto reveal the effects of crystal symmetry on the magnetism and the transport properties of antiferromagneticSrRu1−yMnyO3 (y > 0.2). The Ca-content dependences of the lattice constants and volumesuggest that the mixed valence state of Mn3+, Mn4+, Ru4+, and Ru5+ ions in SrRu0.5Mn0.5O3is held for Ca substitution. However, a structural transformation from tetragonal to orthorhombicsymmetry occurs at a Ca content of x 0.2, and a ferromagnetic state appears simultaneously. The Weiss temperature of all samples has a positive value regardless of the magnetic state. Theresistivity decreases as the Ca content increases, and the high temperature part of the resistivitycould be fitted by using the variable range hopping (VRH) model. The localization length increasesas soon as ferromagnetism appears. The Curie temperature seems to depend on the distance betweentransition metal ions. The antiferromagnetic state was explained by using the competitionbetween a ferromagnetic interaction along the c-axis and an antiferromagnetic interaction in theab-plane, and the orthorhombic ferromagnetic state was explained by using a three-dimensionalferromagnetic interaction between Mn ions.
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