Magnetic excitations and spin gap in KCuCl3

被引：12

作者：

Cavadini, N ^{[1
]}

Henggeler, W

Furrer, A

Güdel, HU

Krämer, K

Mutka, H

机构：

[1] ETH Zurich, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[3] Univ Bern, Dept Chem & Biochem, CH-3000 Bern, Switzerland

[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

PHYSICA B | 2000年 / 276卷

关键词：

Heisenberg magnets; low-dimensional magnetism; spin ladders;

D O I：

10.1016/S0921-4526(99)01747-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Detailed knowledge of the dynamical spin-spin correlation function S(kappa,omega) turns out to be a necessity in characterizing unconventional quantum spin systems - in particular if a finite spin excitation gap separates a singlet ground state from excited states. Basic predictions relying on a Heisenberg dimer model are presented in the context of neutron scattering investigations on the S = 1/2 CU2+ compound KCuCl3. Expressions concerning dispersion relation, intensity and field dependence of the observed singlet-triplet modes above the gap are derived and compared to the experimental results. The agreement between theory and experiment is found to be remarkably good, supporting the characterization of KCuCl3 as a quantum spin liquid near to the dimer limit. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：540 / 542

页数：3

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