Vortex dynamics and frustration in two-dimensional triangular chromium lattices

M. Hemmida, H.-A. Krug von Nidda, N. Büttgen, A. Loidl, L. K. Alexander, R. Nath, A. V. Mahajan, R. F. Berger, R. J. Cava, Yogesh Singh, and D. C. Johnston
Phys. Rev. B 80, 054406 – Published 12 August 2009


The spin dynamics of the two-dimensional (2D) triangular lattice antiferromagnets HCrO2, LiCrO2, and NaCrO2 is investigated by electron spin resonance. In these oxides, on approaching the Néel temperature TN from above, the divergence of the temperature dependent linewidth is well described in terms of a Berezinskii-Kosterlitz-Thouless scenario due to magnetic vortex-antivortex pairing. A refined analysis suggests analogies to the melting scenario of a 2D triangular lattice described by Nelson, Halperin, and Young.

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  • Received 25 May 2009


©2009 American Physical Society

Authors & Affiliations

M. Hemmida1, H.-A. Krug von Nidda1, N. Büttgen1, A. Loidl1, L. K. Alexander2, R. Nath2,3, A. V. Mahajan2, R. F. Berger4, R. J. Cava4, Yogesh Singh3, and D. C. Johnston3

  • 1Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany
  • 2Department of Physics, Indian Institute of Technology, Mumbai 400076, India
  • 3Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 4Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA

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Vol. 80, Iss. 5 — 1 August 2009

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