Heat capacity of the quantum magnet TiOCl

J. Hemberger; M. Hoinkis; M. Klemm; M. Sing; R. Claessen; S. Horn; A. Loidl

doi:10.1103/PhysRevB.72.012420

Heat capacity of the quantum magnet TiOCl

Strongly Correlated Electrons 2007-05-23 v1 Materials Science

Authors: J. Hemberger , M. Hoinkis , M. Klemm , M. Sing , R. Claessen , S. Horn , A. Loidl

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Abstract

Measurements of the heat capacity C(T,H) of the one-dimensional quantum magnet TiOCl are presented for temperatures 2K < T < 300K and magnetic fields up to 5T. Distinct anomalies at 91K and 67K signal two subsequent phase transitions. The lower of these transitions clearly is of first order and seems to be related to the spin degrees of freedom. The transition at 92K probably involves the lattice and/or orbital moments. A detailed analysis of the data reveals that the entropy change through both transitions is surprisingly small (~ 0.1R), pointing to the existence strong fluctuations well into the non-ordered high-temperature phase. No significant magnetic field dependence was detected.

Keywords

heat capacity quantum magnet TiOCl phase transition spin degrees of freedom

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@article{arxiv.cond-mat/0501517,
  title  = {Heat capacity of the quantum magnet TiOCl},
  author = {J. Hemberger and M. Hoinkis and M. Klemm and M. Sing and R. Claessen and S. Horn and A. Loidl},
  journal= {arXiv preprint arXiv:cond-mat/0501517},
  year   = {2007}
}

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4 pages, 2 figures

Heat capacity of the quantum magnet TiOCl

Abstract

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