Metal-insulator transition in the oxysulfides (La1-xCaxO) Cu1-xNixS studied by NMR

被引：9

作者：

Furukawa, Y ^{[1
]}

Ikeda, S

Kumagai, K

Mori, K

Takano, Y

Sekizawa, K

机构：

[1] Hokkaido Univ, Grad Sch Sci, Div Phys, Sapporo, Hokkaido 0600810, Japan

[2] Nihon Univ, Coll Sci & Technol, Dept Phys, Tokyo 1010062, Japan

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.62.15598

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electronic states of (La1-xCaxO)Cu1-xNixS were investigated by Cu-63 and La-139 nuclear-magnetic-resonance measurements. The nuclear spin-lattice relaxation of Cu-63 in insulating (LaO)CuS (x=0) is confirmed to be of quadrupole origin. The ionic state of the Cu ion is considered to be Cu1+ (S=0) in (LaO)CuS. In the hole doped samples x>0.05, the magnetic relaxation dominates in nuclear spin-lattice relaxation (T-1) at low temperature, where it follows the Korringa relation of T1T=const, suggesting that the system is in a metallic state. The x dependence of (T1T)(-1/2) indicates that the metal-insulator transition is caused by diminishing the hole concentration with decreasing x.

引用

页码：15598 / 15603

页数：6

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