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Quantum phase transition induced by Dzyaloshinskii-Moriya interactions in the kagome antiferromagnet

Authors Cépas, O.
Fong, C.M.
Leung, Pak Wo
Lhuillier, C.
Issue Date 2008
Source Physical Review B , v. 78, (14), October 2008, article number 140405
Summary We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For D<Dc the system is in a moment-free phase, and for D>Dc the system develops antiferromagnetic long-range order. The quantum critical point is found to be Dc≃0.1J using exact diagonalizations and finite-size scaling. This suggests that the kagome compound ZnCu3(OH)6Cl3 may be in a quantum critical region controlled by this fixed point.
ISSN 1098-0121
Rights © 2008 American Physical Society
Language English
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