Spin dynamics of the low-dimensional magnet (CH3)2NH2CuCl3

被引：11

作者：

Stone, Matthew B. ^{[1
]}

Tian, Wei

Granroth, Garrett E.

Lumsden, Mark D.

Chung, J. -H.

Mandrus, David G.

Nagler, Stephen E.

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[3] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

PHYSICA B-CONDENSED MATTER | 2006年 / 385卷

基金：

美国国家科学基金会;

关键词：

antiferromagnet; S=1/2; low dimensional; organo-metallic;

D O I：

10.1016/j.physb.2006.05.145

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Dimethylammonium copper (II) chloride (also known as DMACuCl(3) or MCCL) is a low-dimensional S = (1)/(2) quantum spin system proposed to be an alternating ferro-antiferromagnetic chain with similar magnitude ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions. Subsequently, it was shown that the existing bulk measurements could be adequately modeled by considering DMACuCl(3) as independent AFM and FM dimer spin pairs. We present here new inelastic neutron scattering measurements of the spin excitations in single crystals of DMACuCl(3). These results show significant quasi-one-dimensional coupling, however the magnetic excitations do not propagate along the expected direction. We observe a band of excitations with a gap of Delta = 0.95 MeV and a bandwidth of 0.82 MeV. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：438 / 440

页数：3

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