Metal-insulator transition in the S=1/2 spin ladder system (Sr0.4Ca0.6)(14)Cu24-xCoxO(41-delta)

被引：17

作者：

Akimitsu, J

Uehara, M

Nagata, T

Matsumoto, S

Kitaoka, Y

Takahashi, H

Mori, N

机构：

[1] OSAKA UNIV,FAC ENGN SCI,DEPT MAT PHYS,TOYONAKA,OSAKA 560,JAPAN

[2] UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN

来源：

PHYSICA C | 1996年 / 263卷 / 1-4期

关键词：

D O I：

10.1016/0921-4534(95)00726-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have confirmed that the (Sr0.4Ca0.6)(14)Cu24-xCoxO41-delta system with x = 0 has a spin gap of 735 K from NMR measurement. This system shows a metal-insulator transition at Co content x between 2.9 and 4.5 after high-pressure O-2 annealing (650 degrees C, 8 MPa, 20 h). The behavior of the electrical resistivity for the high-pressure O-2 annealed sample with x = 4.8 can be characterized by the one-dimensional variable range hopping scheme at low temperature. These facts can be interpreted as the trapped hole carriers in the 1D CuO2 chain being released into the ladder by Co doping x above 2.9 under high-pressure O-2 annealing.

引用

页码：475 / 481

页数：7

共 16 条

[1]

[Anonymous], 1990, METAL INSULATOR TRAN

[2] OBSERVATION OF A SPIN GAP IN SRCU2O3 COMPRISING SPIN-1/2 QUASI-1D 2-LEG LADDERS [J].