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Title: Quantum phase transition induced by Dzyaloshinskii-Moriya interactions in the kagome antiferromagnet
Authors: Cépas, O.
Fong, C. M.
Leung, Pak Wo
Lhuillier, C.
Keywords: Antiferromagnetic materials
copper compounds
Heisenberg model
Magnetic transitions
Zinc compounds
Issue Date: 23-Oct-2008
Citation: Physical review B, v. 78, iss. 14, p. 140405, 2008
Abstract: We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For D<Dcthe 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.
Rights: Physical Review B © copyright 2008 American Physical Society. The journal's web site is located at
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