Scale-Free Antiferromagnetic Fluctuations in the s=1/2 Kagome Antiferromagnet Herbertsmithite

被引：123

作者：

de Vries, M. A. ^{[1
,2
,3
,4
]}

Stewart, J. R. ^{[5
,6
]}

Deen, P. P. ^{[5
]}

Piatek, J. O. ^{[2
]}

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

Ronnow, H. M. ^{[2
]}

Harrison, A. ^{[3
,4
,5
]}

机构：

[1] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

[2] Ecole Polytech Fed Lausanne, Lab Quantum Magnetism, CH-1015 Lausanne, Switzerland

[3] Univ Edinburgh, CSEC, Edinburgh EH9 3JZ, Midlothian, Scotland

[4] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JZ, Midlothian, Scotland

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

[6] STFC, Rutherford Appleton Labs, ISIS Facil, Didcot OX11 0DE, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 23期

关键词：

LATTICE; STATE; SUSCEPTIBILITY; LA2CUO4; MODEL;

D O I：

10.1103/PhysRevLett.103.237201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutron spectroscopy and diffuse neutron scattering on herbertsmithite [ZnCu(3)(OH)(6)Cl(2)], a near-ideal realization of the s=1/2 kagome antiferromagnet, reveal the hallmark property of a quantum spin liquid: instantaneous short-ranged antiferromagnetic correlations in the absence of a time-averaged ordered moment. These dynamic antiferromagnetic correlations are weakly dependent of neutron-energy transfer and temperature, and persist up to 25 meV and 120 K. At low energy transfers a shift of the magnetic scattering to low Q is observed with increasing temperature, providing evidence of gapless spinons. It is argued that these observations provide important evidence in favor of resonating-valence-bond theories of (doped) Mott insulators.

引用

页数：4

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