中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(9) ：165-173.DOI:10.1007/s11433-024-2417-8

Evidence for distortion-induced local electric polarization in α-RuCl3

Xinrun Mi De Hou Xiao Wang Sabreen Hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen Wang Aifeng Wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su D.I.Khomskii Mingquan He Zhigao Sheng Young Sun
中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(9) ：165-173.DOI:10.1007/s11433-024-2417-8
✕
  • 万方数据

Evidence for distortion-induced local electric polarization in α-RuCl3

Xinrun Mi 1De Hou 2Xiao Wang 3Sabreen Hammouda 3Caixing Liu 4Zijian Xiong 1Han Li 5Yan Liu 6Guiwen Wang 6Aifeng Wang 1Yisheng Chai 1Yang Qi 7Wei Li 8Xiaoyuan Zhou 1Yixi Su 3D.I.Khomskii 9Mingquan He 1Zhigao Sheng 4Young Sun1
扫码查看

作者信息

  • 1. College of Physics,Center of Quantum Materials and Devices,Chongqing University,Chongqing 401331,China
  • 2. Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Hefei Institutes of Physical Science,Anhui,Chinese Academy of Sciences,Hefei 230031 China;University of Science and Technology of China,Hefei 230026,China
  • 3. Jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum(JCNS-MLZ),Forschungszentrum Jülich GmbH,Garching D-85747,Germany
  • 4. Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,Hefei Institutes of Physical Science,Anhui,Chinese Academy of Sciences,Hefei 230031 China
  • 5. School of Physics,Beihang University,Beijing 100191,China
  • 6. Analytical and Testing Center,Chongqing University,Chongqing 401331,China
  • 7. State Key Laboratory of Surface Physics,Department of Physics,Fudan University,Shanghai 200433,China
  • 8. CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China
  • 9. Ⅱ.Physikalisches Institut,Universität zu Köln,Köln D-50937,Germany
  • 折叠

Abstract

The spin-orbit assisted Mott insulator α-RuCl3 is a prime candidate for material realization of the Kitaev quantum spin liquid.While little attention has been paid to charge degrees of freedom,charge effects,such as electric polarization,may arise in this system.Here,we report distortion-induced local electric polarization in α-RuCl3 as evidenced by single-crystal X-ray diffraction,second harmonic generation(SHG)and dielectric measurements.The SHG signal appears at room temperature and develops substantially in the Kitaev paramagnetic state when short-range spin correlations come into play.Despite sizable pyroelectric currents in the Kitaev paramagnetic state,the absence of hysteresis in the polarization-electric field(P-E)points to the short-range nature of electric polarization.This localized electric polarization is likely the result of distortion-induced charge di-merization,achieved through virtual hopping-induced charge redistribution.In addition,the electric polarization is boosted by short-range spin correlations via spin-phonon coupling in the Kitaev paramagnetic state.Our results emphasize the importance of charge degrees of freedom in α-RuCl3,which establish a novel platform to investigate charge effects in Kitaev materials.

Key words

Mott insulator/Kitaev quantum spin liquid/electric polarization

引用本文复制引用

基金项目

National Natural Science Foundation of China(12047564)

National Natural Science Foundation of China(51725104)

Fundamental Research Funds for the Central Universities(2024CDJXY022)

Chinesisch-Deutsche Mobilit?tsprogamm of Chinesisch-Deutsche Zentrum für Wissenschaftsf?rderung(M-0496)

Open Fund of the China Spallation Neutron Source Songshan Lake Science City(DG2431351H)

Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)(277146847-CRC 1238)

National Natural Science Foundation of China(12227806)

National Natural Science Foundation of China(11974036)

National Natural Science Foundation of China(11834014)

出版年

2024
中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
段落导航相关论文