Charge disproportionation in YNiO3 : ESR and susceptibility study

Article

关键词: RNIO3 PEROVSKITES;    METAL-INSULATOR;    TRANSITION;    RESONANCE;    LANIO3;    MNF2;   

DOI  :  10.1103/PhysRevB.68.024429

来源: SCIE

【 摘 要 】

We present a study of the magnetic properties of YNiO3 in the paramagnetic range above and below the metal-insulator (MI) transition. The dc susceptibility chi(dc) (measured up to 1000 K) is a decreasing function of T for T>150 K (the Neel temperature) and we observe two different Curie-Weiss regimes corresponding to the metallic and insulating phases. In the metallic phase, this behavior seems to be associated with the small ionic radius of Y3+. An electron spin resonance (ESR) spectrum compatible with Ni2+ is visible in the insulating phase but only a fraction of the Ni ions contributes to this resonance. We explain the ESR and chi(dc) behavior for T Ni2++Ni4+, associated with the previously observed structural transition across T-MI. Effects of thermally excited electronic configurations on chi(dc) are discussed.

【 授权许可】

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