Absence of Jahn-Teller transition in the hexagonal Ba3CuSb2O9 single crystal

N. Katayama; K. Kimura; Y. Han; J. Nasu; N. Drichko; Y. Nakanishi; M. Halim; Y. Ishiguro; R. Satake; E. Nishibori; M. Yoshizawa; T. Nakano; Y. Nozue; Y. Wakabayashi; S. Ishihara; M. Hagiwara; H. Sawa; S. Nakatsuji

doi:10.1073/pnas.1508941112

Absence of Jahn-Teller transition in the hexagonal Ba3CuSb2O9 single crystal

Strongly Correlated Electrons 2016-02-17 v2

Authors: N. Katayama , K. Kimura , Y. Han , J. Nasu , N. Drichko , Y. Nakanishi , M. Halim , Y. Ishiguro , R. Satake , E. Nishibori , M. Yoshizawa , T. Nakano , Y. Nozue , Y. Wakabayashi , S. Ishihara , M. Hagiwara , H. Sawa , S. Nakatsuji

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Abstract

We present a comprehensive structural study on perovskite-type 6H-Ba3CuSb2O9, which exhibits a spin-orbital short-range ordering on a honeycomb-based lattice. By combining synchrotron x-ray diffraction, electron spin resonance, ultrasound measurement and Raman spectroscopy, we found that the static Jahn-Teller distortion is absent down to the lowest temperature in the present material, indicating orbital ordering is strongly suppressed. We discuss such an unusual state is realized with the help of spin degree of freedom, leading to a spin-orbital entangled liquid state.

Keywords

Jahn-Teller effect spin-orbital entanglement honeycomb lattice perovskite short-range order

Cite

@article{arxiv.1403.4779,
  title  = {Absence of Jahn-Teller transition in the hexagonal Ba3CuSb2O9 single crystal},
  author = {N. Katayama and K. Kimura and Y. Han and J. Nasu and N. Drichko and Y. Nakanishi and M. Halim and Y. Ishiguro and R. Satake and E. Nishibori and M. Yoshizawa and T. Nakano and Y. Nozue and Y. Wakabayashi and S. Ishihara and M. Hagiwara and H. Sawa and S. Nakatsuji},
  journal= {arXiv preprint arXiv:1403.4779},
  year   = {2016}
}

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12 pages, 6 figures, submitted to PRL

Absence of Jahn-Teller transition in the hexagonal Ba3CuSb2O9 single crystal

Abstract

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