Spin dynamics of the spin-1/2 kagome lattice antiferromagnet ZnCu3(OH)6Cl2

J. S. Helton, K. Matan, M. P. Shores, E. A. Nytko, B. M. Bartlett, Y. Yoshida, Y. Takano, A. Suslov, Y. Qiu, J. H. Chung, D. G. Nocera, Y. S. Lee

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Abstract

We have performed thermodynamic and neutron scattering measurements on the S=1/2 kagomé lattice antiferromagnet ZnCu3(OH)6Cl2. The susceptibility indicates a Curie-Weiss temperature of θCW-300K; 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 temperature dependence. These results suggest that an unusual spin liquid state with essentially gapless excitations is realized in this kagomé lattice system.

Original languageEnglish
Article number107204
JournalPhysical review letters
Volume98
Issue number10
DOIs
Publication statusPublished - 2007 Mar 9

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Helton, J. S., Matan, K., Shores, M. P., Nytko, E. A., Bartlett, B. M., Yoshida, Y., Takano, Y., Suslov, A., Qiu, Y., Chung, J. H., Nocera, D. G., & Lee, Y. S. (2007). Spin dynamics of the spin-1/2 kagome lattice antiferromagnet ZnCu3(OH)6Cl2. Physical review letters, 98(10), [107204]. https://doi.org/10.1103/PhysRevLett.98.107204