Transport and magnetic properties of the spin-1/2 ladder system (Sr,A)(14)Cu24O41 (A=Ba and Ca)

被引：9

作者：

Kato, M ^{[1
]}

Shiota, K ^{[1
]}

Ikeda, S ^{[1
]}

Maeno, Y ^{[1
]}

Fujita, T ^{[1
]}

Koike, Y ^{[1
]}

机构：

[1] HIROSHIMA UNIV, DEPT PHYS, HIGASHIHIROSHIMA 724, JAPAN

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1996年 / 263卷 / 1-4期

关键词：

D O I：

10.1016/0921-4534(95)00790-3

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the transport and magnetic properties of the spin-1/2 ladder system with two legs, Sr(14-x)A(x)Cu(24)O(41) (A = Ba and Ca), For x = 0, the electrical resistivity rho exhibits semiconductive behavior. It becomes more insulating with the increase in x(Ba), while it becomes more conductive with the increase in x(Ca). The broad peak of the magnetic susceptibility around 80 K has been studied in detail, Subtracting the Curie component at low temperatures, the remainder of the susceptibility (chi s)(T) decreases towards zero with decreasing temperature below similar to 80 K, which implies the presence of a spin gap. The value of (chi s)(T) decreases with the increase in x(Ba), while it tends to increase with the increase in x(Ca). Moreover, for the samples with x = 0 annealed under various atmospheres. rho tends to decrease and (chi s)(T) increases with the decrease in oxygen content. These properties are discussed in terms of the redistribution of holes between the two different sites of Cu. It seems that the observed spin-gap behavior is due to Cu2+ spins in the CuO2-chain rather than in the Cu2O3-plane.

引用

页码：482 / 485

页数：4

共 8 条

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