Excitations in a four-leg antiferromagnetic Heisenberg spin tube

被引：45

作者：

Garlea, V. O. ^{[1
]}

Zheludev, A. ^{[1
]}

Regnault, L. -P. ^{[2
]}

Chung, J. -H. ^{[3
,4
]}

Qiu, Y. ^{[3
,4
]}

Boehm, M. ^{[5
]}

Habicht, K. ^{[6
]}

Meissner, M. ^{[6
]}

机构：

[1] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

[2] CEA, DRFMC SPSMS MDN, F-38054 Grenoble 9, France

[3] Natl Inst Stand & Technol, NCNR, Gaithersburg, MD 20899 USA

[4] Univ Maryland, College Pk, MD 20742 USA

[5] Inst Laue Langevin, F-38042 Grenoble 9, France

[6] BENSC, Hahn Meitner Inst Kernforsch Berlin GmbH, D-14109 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.100.037206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Inelastic neutron scattering is used to investigate magnetic excitations in the quasi-one-dimensional quantum spin-liquid system Cu(2)Cl(4)center dot D(8)C(4)SO(2). Contrary to previously conjectured models that relied on bond-alternating nearest-neighbor interactions in the spin chains, the dominant interactions are actually next-nearest-neighbor in-chain antiferromagnetic couplings. The appropriate Heisenberg Hamiltonian is equivalent to that of a S=1/2 4-leg spin-tube with almost perfect one dimensionality and no bond alternation. A partial geometric frustration of rung interactions induces a small incommensurability of short-range spin correlations.

引用

页数：4

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