Local-moment formation and metal-nonmetal transition in Ca1−x Y x VO3 and Ca1−x Y x TiO3 |
| |
Authors: | Y Nishihara H Kawanaka H Bando |
| |
Affiliation: | (1) Faculty of Science, Ibaraki University, Mito, 310-8512 Ibaraki, Japan;(2) National Institute of Advanced Industrial Science and Technology, 305-8568 Tsukuba, Ibaraki, Japan |
| |
Abstract: | Electron-doped metallic states of Ca1?x Y x VO3 and Ca1?x Y x TiO3 change into non-metallic states around x~0.4 and 0.6, respectively. The residual resistivity in the metallic states increases with increasing effective magnetic moment or coefficient of T 2 term of resistivity. The effective moment reaches ~ 0.5 µB/molecule in Ca1?x Y x VO3 and also in Ca1?x Y x TiO3 near the metal-nonmetal phase boundary. In these metallic states. ~ 10% of 3d atoms seem to have large localized magnetic moments. In electron-doped metallic sample of Ca1?x Y x VO3, the temperature dependence of resistance shows no resistance-minimum. However, weak negative magneto-resistance is observed for the sample with x=0.2 up to 50 Tesla at 4.2 K. |
| |
Keywords: | Metal-nonmetal phase boundary local moment formation Ca1− x Y x VO3 |
本文献已被 SpringerLink 等数据库收录! |
|