Interplay of quantum and thermal fluctuations in a frustrated magnet

S. V. Isakov and R. Moessner
Phys. Rev. B 68, 104409 – Published 10 September 2003
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Abstract

We demonstrate the presence of an extended critical phase in the transverse field Ising magnet on the triangular lattice, in a regime where both thermal and quantum fluctuations are important. We map out a complete phase diagram by means of quantum Monte Carlo simulations, and find that the critical phase is the result of thermal fluctuations destabilising an order established by the quantum fluctuations. It is separated by two Kosterlitz-Thouless transitions from the paramagnet on one hand and the quantum-fluctuation driven three-sublattice ordered phase on the other. Our work provides further evidence that the zero temperature quantum phase transition is in the three-dimensional XY universality class.

  • Received 6 February 2003

DOI:https://doi.org/10.1103/PhysRevB.68.104409

©2003 American Physical Society

Authors & Affiliations

S. V. Isakov1 and R. Moessner2

  • 1Department of Physics, Stockholm University, AlbaNova, S-106 91 Stockholm, Sweden
  • 2Laboratoire de Physique Théorique de l’Ecole Normale Supérieure, CNRS-UMR8549, Paris, France

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Vol. 68, Iss. 10 — 1 September 2003

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