Longitudinal magnon in the tetrahedral spin system Cu2Te2O5Br2 near quantum criticality

C. Gros, P. Lemmens, M. Vojta, R. Valentí, K.-Y. Choi, H. Kageyama, Z. Hiroi, N. V. Mushnikov, T. Goto, M. Johnsson, and P. Millet
Phys. Rev. B 67, 174405 – Published 8 May 2003
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Abstract

We present a comprehensive study of the coupled tetrahedra compound Cu2Te2O5Br2 by theory and experiments in external magnetic fields. We report the observation of a longitudinal magnon in Raman scattering in the ordered state close to quantum criticality. We show that the excited tetrahedral-singlet sets the energy scale for the magnetic ordering temperature TN. This energy is determined experimentally. The ordering temperature TN has an inverse-log dependence on the coupling parameters near quantum criticality.

  • Received 28 January 2003

DOI:https://doi.org/10.1103/PhysRevB.67.174405

©2003 American Physical Society

Authors & Affiliations

C. Gros1, P. Lemmens2,4, M. Vojta3, R. Valentí1, K.-Y. Choi4, H. Kageyama5, Z. Hiroi5, N. V. Mushnikov5, T. Goto5, M. Johnsson6, and P. Millet7

  • 1Fakultät 7, Theoretische Physik, Universität des Saarlands, D-66041 Saarbrücken, Germany
  • 2Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
  • 3Theoretische Physik III, Universität Augsburg, D-86135 Augsburg, Germany
  • 42. Physikalisches Institut, RWTH Aachen, D-52056 Aachen, Germany
  • 5Institute for Solid State Physics, Univ. of Tokyo, Kashiwa-shi, Chiba 277-8581, Kashiwa, Japan
  • 6Department of Inorganic Chemistry, Stockholm Univ., S-10691 Stockholm, Sweden
  • 7Centre d’Elaboration de Matériaux et d’Etudes Structurales, CEMES/CNRS, F-31062 Toulouse, France

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Issue

Vol. 67, Iss. 17 — 1 May 2003

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