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@ARTICLE{Mi:1030509,
      author       = {Mi, Xinrun and Hou, De and Wang, Xiao and Hammouda, Sabreen
                      and Liu, Caixing and Xiong, Zijian and Li, Han and Liu, Yan
                      and Wang, Guiwen and Wang, Aifeng and Chai, Yisheng and Qi,
                      Yang and Li, Wei and Zhou, Xiaoyuan and Su, Yixi and
                      Khomskii, D. I. and He, Mingquan and Sheng, Zhigao and Sun,
                      Young},
      title        = {{E}vidence for distortion-induced local electric
                      polarization in α-{R}u{C}l3},
      journal      = {Science China / Physics, mechanics $\&$ astronomy},
      volume       = {67},
      number       = {9},
      issn         = {1674-7348},
      address      = {Heidelberg},
      publisher    = {Springer},
      reportid     = {FZJ-2024-05332},
      pages        = {297511},
      year         = {2024},
      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 dimerization, 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.},
      cin          = {JCNS-FRM-II / MLZ / JCNS-4},
      ddc          = {520},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
                      I:(DE-Juel1)JCNS-4-20201012},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001286330700005},
      doi          = {10.1007/s11433-024-2417-8},
      url          = {https://juser.fz-juelich.de/record/1030509},
}