PROTON SPIN-LATTICE RELAXATION IN THE QUASI-ONE-DIMENSIONAL S=1 HEISENBERG-ANTIFERROMAGNET NI(C2H8N2)2NO2(CLO4)

被引：15

作者：

GOTO, T ^{[1
]}

FUJIWARA, N ^{[1
]}

KOHMOTO, T ^{[1
]}

MAEGAWA, S ^{[1
]}

机构：

[1] KYOTO UNIV,FAC SCI,DEPT PHYS,KYOTO 606,JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1990年 / 59卷 / 04期

关键词：

D O I：

10.1143/JPSJ.59.1135

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Proton spin-lattice relaxation time T1 in the Haldane-gap system with S=1, Ni(C2H8N2)2NO2(ClO4), was measured at temperatures between 1.4 K and 77 K. The relaxation rate T1-1 decreased over more than three orders of magnitude with decreasing temperature, thus suggesting scarce development of the antiferromagnetic short-range order. Monotonous decrease of T1-1 above 6 K was analyzed on the basis of the theory for insulating paramagnets using static susceptibility data. To explain the behavior of 7//1 below 6K, which accompanies a rounded peak, we consider the effect of local-field fluctuation of the order of the nuclear Larmor period, which is as-sociated with magnetic excitation from the nonmagnetic ground state. © 1990, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

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页码：1135 / 1138

页数：4

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