Pair correlations, short-range order, and dispersive excitations in the quasi-kagome quantum magnet volborthite

被引：25

作者：

Nilsen, G. J. ^{[1
,2
,3
]}

Coomer, F. C. ^{[3
]}

de Vries, M. A. ^{[4
]}

Stewart, J. R. ^{[5
]}

Deen, P. P. ^{[6
]}

Harrison, A. ^{[3
,7
]}

Ronnow, H. M. ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, ICMP, Lab Quantum Magnetism, Lausanne, Switzerland

[2] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[3] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JJ, Midlothian, Scotland

[4] Univ Leeds, Dept Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[5] STFC, Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0DE, Oxon, England

[6] ESS AB, European Spallat Source, SE-22100 Lund, Sweden

[7] Inst Laue Langevin, FR-38042 Grenoble, France

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 17期

关键词：

ANTIFERROMAGNET;

D O I：

10.1103/PhysRevB.84.172401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present spatial and dynamic information on the s = 1/2 distorted kagome antiferromagnet volborthite, Cu3V2O7(OD)(2) center dot 2D(2)O, obtained by polarized and inelastic neutron scattering. The instantaneous structure factor, S(Q), is dominated by nearest-neighbor pair correlations, with short-range order at wave vectors Q(1) = 0.65(3) angstrom(-1) and Q(2) = 1.15(5) angstrom(-1) emerging below 5 K. The excitation spectrum, S(Q,omega), reveals two steep branches dispersing from Q(1) and Q(2), and a flat mode omega(f) = 5.0(2) meV. The results allow us to identify the crossover at T* similar to 1 K in V-51 NMR and specific-heat measurements as the buildup of correlations at Q(1). We compare our data to theoretical models proposed for volborthite, and also demonstrate that the excitation spectrum can be explained by spin-wave-like excitations with anisotropic exchange parameters, as suggested by recent local-density calculations.

引用

页数：4

共 20 条

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