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Title: Quantum phase transition and destruction of Kondo effect in pressurized SmB 6

SmB 6 has been a well-known Kondo insulator for decades, but recently attracts extensive new attention as a candidate topological system. Studying SmB 6 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.
Authors:
 [1] ;  [1] ; ORCiD logo [2] ;  [3] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [1] ;  [5] ;  [6] ;  [7] more »;  [8] ;  [8] « less
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics and Beijing National Lab. for Condensed Matter Physics
  2. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. 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)
  4. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Synchrotron Radiation Facilities, Shanghai Inst. of Applied Physics
  5. 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)
  6. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  7. 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
  8. 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)
Publication Date:
Report Number(s):
LA-UR-17-30508
Journal ID: ISSN 2095-9273
Grant/Contract Number:
AC52-06NA25396; 2013/2018-0; W911NF-14-1-0525; C-1411
Type:
Accepted Manuscript
Journal Name:
Science Bulletin
Additional Journal Information:
Journal Volume: 62; Journal Issue: 21; Journal ID: ISSN 2095-9273
Publisher:
Elsevier; Science China Press
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
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 (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Material Science; High pressure; Kondo insulator; Surface state; SmB6
OSTI Identifier:
1431072