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

Katayama, Naoyuki, Kimura, Kenta, Han, Yibo, Nasu, Joji, Drichko, Natalia, Nakanishi, Yoshiki, Halim, Mario, Ishiguro, Yuki, Satake, Ryuta, Nishibori, Eiji, Yoshizawa, Masahito, Nakano, Takehito, Nozue, Yasuo, Wakabayashi, Yusuke, Ishihara, Sumio, Hagiwara, Masayuki, Sawa, Hiroshi, Nakatsuji, Satoru
Proceedings of the National Academy of Sciences of the United States of America 2015 v.112 no.30 pp. 9305-9309
cupric oxide, energy, models, temperature
The quantum spin liquid state has been intensively pursued since Anderson proposed the resonating valence bond model. On the other hand, quantum liquids based on another electronic degree of freedom, orbital, has been believed unrealistic, because the energy scale of orbital correlation is normally one order of magnitude higher than spin exchange coupling, resulting in an orbital ordering at a signicantly high temperature accompanied by a cooperative Jahn−Teller (JT) distortion. In this paper, we present striking complete suppression of the JT transition in the copper oxide, 6 H -Ba ₃ CuSb ₂O ₉ based on comprehensive structural studies, indicating the realization of the novel “spin–orbital liquid” state.