Itinerant-to-localized electron transition in perovskite CaRu1-xRhxO3
Itinerant-to-localized electron transition in perovskite CaRu1-xRhxO3
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DOI：
10.1063/1.365056
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发表时间：
1997-04-15
影响因子：
3.2
通讯作者：
Crow, JE
中科院分区：
文献类型：
--
作者：
Cao, G;Freibert, F;Crow, JE
测量磁化率chi（T）（2 ≤ T ≤ 400 K）、电阻率rho（T）（2 ≤ T ≤ 300 K）和畸变钙钛矿CaRu 1-xRhxO 3的霍尔效应，其中0 ≤ x ≤ 0.35。这项研究表明，磁性和运输性能的CaRuO 3，一个窄的4D带的顺磁导体，在一个非常敏感的方式取决于带填充和带宽的程度。轻微的Rh掺杂，同时保持晶体结构，有效地缩小了4d带，并增强了自旋相关。增强的自旋相关的发生伴随着巡回本地化的电子跃迁和晶体学常数的变化。与其他人一起提出的结果强烈表明，CaRuO_3，是在金属-绝缘体转变和磁有序的边缘。(C)1997年美国物理学会。
Magnetic susceptibility chi(T) (2 less than or equal to T less than or equal to 400 K), electrical resistivity rho(T) (2 less than or equal to T less than or equal to 300 K), and Hall effect of the distorted perovskite CaRu1-xRhxO3 with 0 less than or equal to x less than or equal to 0.35 were measured. This study indicates that the magnetic and transport properties of CaRuO3, a paramagnetic conductor with a narrow 4d-band, depend in an extremely sensitive way on the degree of band filling and bandwidth. Slight Rh doping, while retaining the crystals structure, effectively narrows the 4d-band, and enhances the spin correlation. The occurrence of the enhanced spin correlation is accompanied by an itinerant-to-localized electron transition and a change in crystallographic constants. The results presented together with others strongly suggests that CaRuO3, is on the verge of the metal-insulator transition and magnetic ordering. (C) 1997 American Institute of Physics.