Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2

We have performed thermodynamic and neutron scattering measurements on the S=1/2 kagome lattice antiferromagnet Zn Cu_3 (OH)_6 Cl_2. The susceptibility indicates a Curie-Weiss temperature of ~ -300 K; however, no magnetic order is observed down to 50 mK. Inelastic neutron scattering reveals a spectr...

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Bibliographic Details
Published inarXiv.org
Main Authors Helton, J S, Matan, K, Shores, M P, Nytko, E A, Bartlett, B M, Yoshida, Y, Takano, Y, Suslov, A, Qiu, Y, J -H Chung, Nocera, D G, Lee, Y S
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 02.04.2007
Subjects
Antiferromagnetism
Curie temperature
Excitation
Inelastic scattering
Kagome lattice
Magnetic permeability
Neutron scattering
Neutrons
Spin dynamics
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Summary:We have performed thermodynamic and neutron scattering measurements on the S=1/2 kagome lattice antiferromagnet Zn Cu_3 (OH)_6 Cl_2. The susceptibility indicates a Curie-Weiss temperature of ~ -300 K; however, no magnetic order is observed down to 50 mK. Inelastic neutron scattering reveals a spectrum of low energy spin excitations with no observable gap down to 0.1 meV. The specific heat at low-T follows a power law with exponent less than or equal to 1. These results suggest that an unusual spin-liquid state with essentially gapless excitations is realized in this kagome lattice system.
ISSN:2331-8422
DOI:10.48550/arxiv.0610539