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Spin Dynamics of the Spin- 1/2 Kagome Lattice Antiferromagnet ZnCu3(OH)6Cl2

Year: 2007
Type: article
Abstract: We have performed thermodynamic and neutron scattering measurements on the $S=1/2$ kagom\'e lattice antiferromagnet ${\mathrm{ZnCu}}_{3}(\mathrm{OH}{)}_{6}{\mathrm{Cl}}_{2}$. The susceptibility indicates a Curie-Weiss temperature of ${\ensuremath{\theta}}_{\mathrm{CW}}\ensuremath{\simeq}\ensuremath{-}300\text{ }\text{ }\mathrm{K}$; 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 kagom\'e lattice system.
DOI: 10.1103/physrevlett.98.107204
Authors: 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
Institutions: Massachusetts Institute of Technology, University of Florida, National High Magnetic Field Laboratory, National Institute of Standards and Technology, NIST Center for Neutron Research, University of Maryland, College Park
Language: English
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, National High Magnetic Field Laboratory, Materials Research Science and Engineering Center, Harvard University, Division of Materials Research, State of Florida
Awards: G1169002449, CAREER: Neutron and X-Ray Scattering Studies of Unconventional Phase Transitions in Materials with Strong Interactions or Fluctuations, The NIST/NSF Center for High Resolution Neutron Scattering, G2599674814, National High Magnetic Field Laboratory, G8118105901
OpenAlex ID: W2009749005
FWCI: 34.49
Cites: 30
Cited by: 832
Related to: 8