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

doi:10.1103/PhysRevMaterials.5.075002

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

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

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.

Original language	English
Article number	075002
Journal	Physical Review Materials
Volume	5
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevMaterials.5.075002
Publication status	Published - 2021 Jul

ASJC Scopus subject areas

Materials Science(all)
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevMaterials.5.075002

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title = "Spin-orbital liquid in Ba3CuSb2 O9 stabilized by oxygen holes",

abstract = "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.",

author = "Kou Takubo and Huiyuan Man and Satoru Nakatsuji and Kohei Yamamoto and Yujun Zhang and Yasuyuki Hirata and Hiroki Wadati and Akira Yasui and Takashi Mizokawa and Khomskii, {Daniel I.}",

note = "Funding Information: We are grateful for fruitful discussions with and support from S. Koshihara and T. Ishikawa. XAS measurements were performed under the approval of Synchrotron Radiation Research Organization, the University of Tokyo (No. 2015A7401, 2018B7577). HAXPES measurements were performed under the approval of SPring-8 (No. 2018B1449). The work of D.I.K. is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Project number 277146847, CRC 1238. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = jul,

doi = "10.1103/PhysRevMaterials.5.075002",

language = "English",

volume = "5",

journal = "Physical Review Materials",

issn = "2475-9953",

publisher = "American Physical Society",

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T1 - Spin-orbital liquid in Ba3CuSb2 O9 stabilized by oxygen holes

AU - Takubo, Kou

AU - Man, Huiyuan

AU - Nakatsuji, Satoru

AU - Yamamoto, Kohei

AU - Zhang, Yujun

AU - Hirata, Yasuyuki

AU - Wadati, Hiroki

AU - Yasui, Akira

AU - Mizokawa, Takashi

AU - Khomskii, Daniel I.

N1 - Funding Information: We are grateful for fruitful discussions with and support from S. Koshihara and T. Ishikawa. XAS measurements were performed under the approval of Synchrotron Radiation Research Organization, the University of Tokyo (No. 2015A7401, 2018B7577). HAXPES measurements were performed under the approval of SPring-8 (No. 2018B1449). The work of D.I.K. is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Project number 277146847, CRC 1238. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/7

Y1 - 2021/7

N2 - 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.

AB - 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.

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Spin-orbital liquid in Ba3CuSb2 O9 stabilized by oxygen holes

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