Symmetry origin of the phase transitions and phase separation in manganites at low doping

Article

关键词: GIANT MAGNETORESISTANCE;    LANTHANUM MANGANITES;    ELECTRONIC MODELS;    MAGNETIC-FIELD;    LA1-XCAXMNO3;    ANTIFERROMAGNETISM;    LA1-XSRXMNO3;    TRANSPORT;    FILMS;   

DOI  :  10.1103/PhysRevB.60.11883

来源: SCIE

【 摘 要 】

We analyze the symmetry changes of paramagnetic to A-type antiferromagnetic and to ferromagnetic phase transitions in undoped and moderately doped LaMnO3, respectively. We show that in orthorhombic-distorted perovskite manganites the phase separation at low doping is associated with the noncollinear nature of the magnetic orders permitted by symmetry. A simple model for the competition between the two phase transitions is put forward within the framework of the Landau theory of phase transitions. [S0163-1829(99)03038-6].

【 授权许可】

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