NMR study on spin gap in spin ladder Sr14Cu24O41

被引：54

作者：

Tsuji, S ^{[1
]}

Kumagai, K ^{[1
]}

Kato, M ^{[1
]}

Koike, Y ^{[1
]}

机构：

[1] TOHOKU UNIV, FAC ENGN, DEPT APPL PHYS, SENDAI, MIYAGI 98077, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1996年 / 65卷 / 11期

关键词：

NMR; NQR; nuclear spin-lattice relaxation time; spin gap; spin ladder; Sr14Cu24O41;

D O I：

10.1143/JPSJ.65.3474

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated spin dynamics of both the ladder and the chain sites in Sr14Cu24O41 by Cu-NMR and Cu-NQR. From the NMR shift, K-spin, and nuclear spin-lattice relaxation time, T-1, the energy gaps in the spin excitation spectrum are confirmed to be Delta = 140 K for the chain site and Delta = 470 K for the ladder site for Sr14Cu24O41. Doping effects on the spin gaps and electric field gradient at the Cu sites were also investigated by the substituting of Ca, Y and La for Sr. The spin gap of the ladder site decreases with increasing x for Sr14-xCaxCu24O41 and seems to collapse at around x = 13 for Ca substitution.

引用

页码：3474 / 3477

页数：4

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