Infrared phonons and specific heat in the gapped quantum magnet Ba3Cr2O8

Zhe Wang, M. Schmidt, A. Günther, F. Mayr, Yuan Wan, S.-H. Lee, H. Ueda, Y. Ueda, A. Loidl, and J. Deisenhofer
Phys. Rev. B 85, 224304 – Published 28 June 2012

Abstract

We report on the phonon spectrum of the spin-gapped quantum magnet Ba3Cr2O8 determined by infrared spectroscopy, and on specific heat measurements across the Jahn-Teller transition in magnetic fields up to 9 T. Phonon modes split below the Jahn-Teller transition, which occurs at TJT=70 K as detected by specific-heat measurements. The field-dependent specific heat data is analyzed in terms of the contributions from lattice, magnetic and orbital degrees of freedom. In contrast to the isostructural compound Sr3Cr2O8, our analysis does not indicate the existence of orbital fluctuations below the Jahn-Teller transition in Ba3Cr2O8.

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  • Received 4 May 2012

DOI:https://doi.org/10.1103/PhysRevB.85.224304

©2012 American Physical Society

Authors & Affiliations

Zhe Wang1, M. Schmidt1, A. Günther1, F. Mayr1, Yuan Wan2, S.-H. Lee3, H. Ueda4, Y. Ueda4, A. Loidl1, and J. Deisenhofer1

  • 1Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany
  • 2Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 3Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
  • 4Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan

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Issue

Vol. 85, Iss. 22 — 1 June 2012

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