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

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arxiv 1403.4779 v2 pith:MIBX2MNX submitted 2014-03-19 cond-mat.str-el

N. Katayama , K. Kimura , Y. Han , J. Nasu , N. Drichko , Y. Nakanishi , M. Halim , Y. Ishiguro
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R. Satake E. Nishibori M. Yoshizawa T. Nakano Y. Nozue Y. Wakabayashi S. Ishihara M. Hagiwara H. Sawa S. Nakatsuji
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keywords jahn-tellerorderingspinspin-orbitalstateabsenceabsentba3cusb2o9
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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.

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