EXPERIMENTAL-EVIDENCE FOR THE LOWEST EXCITATION MODE IN THE S = 1 HALDANE-GAP SYSTEM - HIGH-FIELD PROTON MAGNETIC-RELAXATION IN NI(C2H8N2)2NO2CLO4

被引：21

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 | 1992年 / 45卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.45.7837

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 the proton in the s = 1 Haldane-gap system Ni(C2H8N2)2NO2ClO4 (NENP) has been measured at low temperatures in high magnetic fields (4 T < H < 8 T) below the critical field. From the experimental results below 4 K, the field dependence of the energy gap for the lowest-energy mode of the three excitation modes, which has been predicted theoretically in NENP, are obtained. The results of T1 below 4 K are well explained by treating the magnetic excitation as free fermions rather than free bosons.

引用

页码：7837 / 7840

页数：4

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