Infrared phonons and specific heat in Ba3Cr2O8

Zhe Wang; M. Schmidt; A. Günther; F. Mayr; Yuan Wan; S. -H. Lee; H. Ueda; Y. Ueda; A. Loidl; J. Deisenhofer

doi:10.1103/PhysRevB.85.224304

Infrared phonons and specific heat in Ba3Cr2O8

Strongly Correlated Electrons 2012-06-29 v2

Authors: Zhe Wang , M. Schmidt , A. Günther , F. Mayr , Yuan Wan , S. -H. Lee , H. Ueda , Y. Ueda , A. Loidl , J. Deisenhofer

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Abstract

We report on the phonon spectrum of 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 T_{JT} = 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.

Keywords

phonon spectrum specific heat Jahn-Teller transition Ba3Cr2O8 orbital fluctuations infrared spectroscopy

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@article{arxiv.1205.2950,
  title  = {Infrared phonons and specific heat in Ba3Cr2O8},
  author = {Zhe Wang and M. Schmidt and A. Günther and F. Mayr and Yuan Wan and S. -H. Lee and H. Ueda and Y. Ueda and A. Loidl and J. Deisenhofer},
  journal= {arXiv preprint arXiv:1205.2950},
  year   = {2012}
}

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5 pages, 4 figures

Infrared phonons and specific heat in Ba3Cr2O8

Abstract

Keywords

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