Induced Random Fields in the LiHoxY1xF4 Quantum Ising Magnet in a Transverse Magnetic Field

S. M. A. Tabei, M. J. P. Gingras, Y.-J. Kao, P. Stasiak, and J.-Y. Fortin
Phys. Rev. Lett. 97, 237203 – Published 7 December 2006

Abstract

The LiHoxY1xF4 magnetic material in a transverse magnetic field Bxx^ perpendicular to the Ising spin direction has long been used to study tunable quantum phase transitions in a random disordered system. We show that the Bx-induced magnetization along the x^ direction, combined with the local random dilution-induced destruction of crystalline symmetries, generates, via the predominant dipolar interactions between Ho3+ ions, random fields along the Ising z^ direction. This identifies LiHoxY1xF4 in Bx as a new random field Ising system. The random fields explain the rapid decrease of the critical temperature in the diluted ferromagnetic regime and the smearing of the nonlinear susceptibility at the spin-glass transition with increasing Bx and render the Bx-induced quantum criticality in LiHoxY1xF4 likely inaccessible.

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  • Received 6 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.237203

©2006 American Physical Society

Authors & Affiliations

S. M. A. Tabei1, M. J. P. Gingras1,2, Y.-J. Kao1,3, P. Stasiak1, and J.-Y. Fortin1,4

  • 1Department of Physics and Astronomy, University of Waterloo, Ontario, N2L 3G1, Canada
  • 2Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
  • 3Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan
  • 4Laboratoire de Physique Théorique, Université Louis Pasteur, 67084 Strasbourg Cedex, France

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Vol. 97, Iss. 23 — 8 December 2006

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