Competition between the singlet-spin liquid state and the magnetic ground state in a two-chain spin-1/2 antiferromagnetic ladder compound LaCuO2.5: A Cu-63 NMR study

被引：34

作者：

Matsumoto, S ^{[1
]}

Kitaoka, Y ^{[1
]}

Ishida, K ^{[1
]}

Asayama, K ^{[1
]}

Hiroi, Z ^{[1
]}

Kobayashi, N ^{[1
]}

Takano, M ^{[1
]}

机构：

[1] KYOTO UNIV,CHEM RES INST,UJI,KYOTO 611,JAPAN

来源：

PHYSICAL REVIEW B | 1996年 / 53卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.53.R11942

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic characteristics of LaCuO2.5 comprising an antiferromagnetic two-chain spin-1/2 ladder have been investigated by Cu-63 NMR measurements. The ground state of this compound was suggested from susceptibility measurements to be the singlet-spin liquid state. The present experiments have, however, revealed that LaCuO2.5 is not in such a spin-liquid state, but rather a magnetic ordering takes place below T-N similar to 110 K as evidenced by the large enhancement of the nuclear spin-lattice relaxation rate, (1/T-1) and of the spin-echo decay rate, 1/T-2 leading to the disappearance of the Cu NMR signal. This magnetic ordered state has been found to be suppressed by substituting Sr for La by 5%, i.e., by hole doping.

引用

页码：11942 / 11945

页数：4

共 16 条

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