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001030509 245__ $$aEvidence for distortion-induced local electric polarization in α-RuCl3
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001030509 520__ $$aThe 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.
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001030509 7001_ $$0P:(DE-HGF)0$$aHou, De$$b1
001030509 7001_ $$0P:(DE-Juel1)171236$$aWang, Xiao$$b2
001030509 7001_ $$0P:(DE-Juel1)190998$$aHammouda, Sabreen$$b3$$ufzj
001030509 7001_ $$0P:(DE-HGF)0$$aLiu, Caixing$$b4
001030509 7001_ $$0P:(DE-HGF)0$$aXiong, Zijian$$b5
001030509 7001_ $$0P:(DE-HGF)0$$aLi, Han$$b6
001030509 7001_ $$0P:(DE-HGF)0$$aLiu, Yan$$b7
001030509 7001_ $$0P:(DE-HGF)0$$aWang, Guiwen$$b8
001030509 7001_ $$0P:(DE-HGF)0$$aWang, Aifeng$$b9
001030509 7001_ $$0P:(DE-HGF)0$$aChai, Yisheng$$b10
001030509 7001_ $$0P:(DE-HGF)0$$aQi, Yang$$b11
001030509 7001_ $$0P:(DE-HGF)0$$aLi, Wei$$b12
001030509 7001_ $$0P:(DE-HGF)0$$aZhou, Xiaoyuan$$b13
001030509 7001_ $$0P:(DE-Juel1)130991$$aSu, Yixi$$b14$$ufzj
001030509 7001_ $$0P:(DE-HGF)0$$aKhomskii, D. I.$$b15
001030509 7001_ $$0P:(DE-HGF)0$$aHe, Mingquan$$b16$$eCorresponding author
001030509 7001_ $$0P:(DE-HGF)0$$aSheng, Zhigao$$b17$$eCorresponding author
001030509 7001_ $$0P:(DE-HGF)0$$aSun, Young$$b18$$eCorresponding author
001030509 773__ $$0PERI:(DE-600)2546757-8$$a10.1007/s11433-024-2417-8$$gVol. 67, no. 9, p. 297511$$n9$$p297511$$tScience China / Physics, mechanics & astronomy$$v67$$x1674-7348$$y2024
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