Spin-orbital liquid in Ba3CuSb2 O9 stabilized by oxygen holes

Kou Takubo, Huiyuan Man, Satoru Nakatsuji, Kohei Yamamoto, Yujun Zhang, Yasuyuki Hirata, Hiroki Wadati, Akira Yasui, Takashi Mizokawa, Daniel I. Khomskii

研究成果: Article査読

2 被引用数 (Scopus)


We report x-ray and optical absorption spectroscopy as well as hard x-ray photoemission spectroscopy on hexagonal Ba3CuSb2O9 in which a Cu 3d spin-orbital liquid state is suggested from absence of the Jahn-Teller distortion of Cu2+O6 octahedra and of the magnetic ordering. The experimental results and their cluster model analysis indicate that O 2p holes play a crucial role in realizing the spin-orbital liquid state of hexagonal Ba3CuSb2O9. These oxygen holes appear due to the "reaction"Sb5+→Sb3++ two O 2p holes, with these holes being able to attach to Cu ions. The present work opens avenues towards spin-charge-orbital entangled liquid state in transition-metal oxides with small or negative charge transfer energy.

ジャーナルPhysical Review Materials
出版ステータスPublished - 2021 7月

ASJC Scopus subject areas

  • 材料科学(全般)
  • 物理学および天文学(その他)


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