SPIN FLUCTUATION AND STATIC PROPERTIES OF THE LOCAL MOMENTS IN THE HALDANE-GAP SYSTEM NI(C2H8N2)2NO2(CLO4) STUDIED BY H-1-NMR

被引:30
作者
FUJIWARA, N [1 ]
GOTO, T [1 ]
MAEGAWA, S [1 ]
KOHMOTO, T [1 ]
机构
[1] KYOTO UNIV,COLL LIBERAL ARTS & SCI,DEPT PHYS,KYOTO 606,JAPAN
来源
PHYSICAL REVIEW B | 1993年 / 47卷 / 18期
关键词
D O I
10.1103/PhysRevB.47.11860
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The nuclear spin-lattice relaxation time T1 of H-1 nuclei in the S = 1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C2H8N2)2NO2(ClO4) (NENP) was measured at temperatures above 1.4 K in the field range below 12 T. The field dependence of the relaxation rate T1(-1) exhibited a maximum at 9.5 T, which corresponds to the critical field, for the field parallel to the chain at low temperatures below 4 K. The experimental results were analyzed by treating the magnetic excitation as free fermions. The H-1 NMR spectra were also measured for various fields and temperatures. The results showed the appearance of static local moments even at fields as low as 3 T. Their temperature and field dependences were explained by considering the mixing of the ground state and the first excited state in the Haldane-gap system.
引用
收藏
页码:11860 / 11869
页数:10
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