Quantum phase transition and destruction of Kondo effect in pressurized SmB6

Zhou, Yazhou; Wu, Qi; Rosa, Priscila Ferrari Silveira; Yu, Rong; Guo, Jing; Yi, Wei; Zhang, Shan; Wang, Zhe; Wang, Honghong; Cai, Shu; Yang, Ke; Li, Aiguo; Jiang, Zheng; Zhang, Shuo; Wei, Xiangjun; Huang, Yuying; Sun, Peijie; Yang, Yi-feng; Fisk, Zachary; Si, Qimiao; Zhao, Zhongxian; Sun, Liling

doi:10.1016/j.scib.2017.10.008

Title: Quantum phase transition and destruction of Kondo effect in pressurized SmB₆

Journal Article · Tue Oct 24 00:00:00 EDT 2017 · Science Bulletin

DOI:https://doi.org/10.1016/j.scib.2017.10.008· OSTI ID:1431072

Zhou, Yazhou ^[1]; Wu, Qi ^[1];

^[2]; Yu, Rong ^[3]; Guo, Jing ^[1]; Yi, Wei ^[1]; Zhang, Shan ^[1]; Wang, Zhe ^[1]; Wang, Honghong ^[1]; Cai, Shu ^[1]; Yang, Ke ^[4]; Li, Aiguo ^[4]; Jiang, Zheng ^[4]; Zhang, Shuo ^[4]; Wei, Xiangjun ^[4]; Huang, Yuying ^[4]; Sun, Peijie ^[1]; Yang, Yi-feng ^[5]; Fisk, Zachary ^[6]; Si, Qimiao ^[7] more »

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics and Beijing National Lab. for Condensed Matter Physics
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Renmin Univ. of China, Beijing (China); Shanghai Jiao Tong Univ., Shanghai (China). Dept. of Physics and Astronomy; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Synchrotron Radiation Facilities, Shanghai Inst. of Applied Physics
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics and Beijing National Lab. for Condensed Matter Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics and Beijing National Lab. for Condensed Matter Physics; Rice Univ., Houston, TX (United States). Dept. of Physics & Astronomy
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics and Beijing National Lab. for Condensed Matter Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)

SmB₆ has been a well-known Kondo insulator for decades, but recently attracts extensive new attention as a candidate topological system. Studying SmB₆ under pressure provides an opportunity to acquire the much-needed understanding about the effect of electron correlations on both the metallic surface state and bulk insulating state. Here we do so by studying the evolution of two transport gaps (low temperature gap E_l and high temperature gap E_h) associated with the Kondo effect by measuring the electrical resistivity under high pressure and low temperature (0.3 K) conditions. We associate the gaps with the bulk Kondo hybridization, and from their evolution with pressure we demonstrate an insulator-to-metal transition at ~4 GPa. At the transition pressure, a large change in the Hall number and a divergence tendency of the electron-electron scattering coefficient provide evidence for a destruction of the Kondo entanglement in the ground state. In conclusion, our results raise the new prospect for studying topological electronic states in quantum critical materials settings.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Laboratory Directed Research and Development (LDRD) Program; US Army Research Office (ARO); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC52-06NA25396; 2013/2018-0; W911NF-14-1-0525; C-1411

OSTI ID:: 1431072

Alternate ID(s):: OSTI ID: 1495505

Report Number(s):: LA-UR-17-30508

Journal Information:: Science Bulletin, Vol. 62, Issue 21; ISSN 2095-9273

Publisher:: Elsevier; Science China PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Title: Quantum phase transition and destruction of Kondo effect in pressurized SmB₆