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Disorder-induced spin-liquid-like behavior in kagome-lattice compounds
Ma, Zhen1,2; Dong, Zhao Yang3; Wu, Si4; Zhu, Yinghao4; Bao, Song1; Cai, Zhengwei1; Wang, Wei1,5; Shangguan, Yanyan1; Wang, Jinghui1,6; Ran, Kejing1,6; Yu, Dehong7; Deng, Guochu7; Mole, Richard A.7; Li, Hai Feng8; Yu, Shun Li1,9; Li, Jian Xin1,9; Wen, Jinsheng1,9
Source PublicationPhysical Review B

Quantum spin liquids (QSLs) are an exotic state of matter that is subject to extensive research. However, the relationship between the ubiquitous disorder and the QSL behaviors is still unclear. Here, by performing comparative experimental studies on two kagomé-lattice QSL candidates, Tm3Sb3Zn2O14 and Tm3Sb3Mg2O14, which are isostructural to each other but with strong and weak structural disorder, respectively, we show unambiguously that the disorder can induce spin-liquid-like features. In particular, both compounds show dominant antiferromagnetic interactions with a Curie-Weiss temperature of -17.4 and -28.7 K for Tm3Sb3Zn2O14 and Tm3Sb3Mg2O14, respectively, but remain disordered down to about 0.05 K. Specific-heat results suggest the presence of gapless magnetic excitations characterized by a residual linear term. Magnetic excitation spectra obtained by inelastic neutron scattering (INS) at low temperatures display broad continua. All these observations are consistent with those of a QSL. However, we find in Tm3Sb3Zn2O14, which has strong disorder resulting from the random mixing of the magnetic Tm3+ and nonmagnetic Zn2+, that the low-energy magnetic excitations observed in the specific-heat and INS measurements are substantially enhanced compared to those of Tm3Sb3Mg2O14, which has much less disorder. We believe that the effective spins of the Tm3+ ions in the Zn2+/Mg2+ sites give rise to the low-energy magnetic excitations, and the amount of the occupancy determines the excitation strength. These results provide direct evidence of the mimicry of a QSL caused by disorder.

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Indexed BySCIE
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000599092300003
Scopus ID2-s2.0-85098119480
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Cited Times [WOS]:1   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorLi, Hai Feng
Affiliation1.National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, China
2.Institute for Advanced Materials, Hubei Normal University, Huangshi, 435002, China
3.Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, 210094, China
4.Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, 999078, Macao
5.School of Science, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
6.School of Physical Science and Technology, ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai, 200031, China
7.Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, New Illawarra Road, 2234, Australia
8.Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, 999078, Macao
9.Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China
Recommended Citation
GB/T 7714
Ma, Zhen,Dong, Zhao Yang,Wu, Si,et al. Disorder-induced spin-liquid-like behavior in kagome-lattice compounds[J]. Physical Review B,2020,102(22).
APA Ma, Zhen,Dong, Zhao Yang,Wu, Si,Zhu, Yinghao,Bao, Song,Cai, Zhengwei,Wang, Wei,Shangguan, Yanyan,Wang, Jinghui,Ran, Kejing,Yu, Dehong,Deng, Guochu,Mole, Richard A.,Li, Hai Feng,Yu, Shun Li,Li, Jian Xin,&Wen, Jinsheng.(2020).Disorder-induced spin-liquid-like behavior in kagome-lattice compounds.Physical Review B,102(22).
MLA Ma, Zhen,et al."Disorder-induced spin-liquid-like behavior in kagome-lattice compounds".Physical Review B 102.22(2020).
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