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. 2007 Mar 9;98(10):107204.
doi: 10.1103/PhysRevLett.98.107204. Epub 2007 Mar 9.

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

J S Helton  1 , 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
Affiliations

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

J S Helton et al. Phys Rev Lett. .

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 theta CW approximately = -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 temperature dependence. These results suggest that an unusual spin liquid state with essentially gapless excitations is realized in this kagomé lattice system.

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