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Evidence of Incoherent Carriers Associated with Resonant Impurity Levels and Their Influence on Superconductivity in the Anomalous Superconductor Pb1-x Tlx Te

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [3];  [7];  [6];  [2]
  1. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials and Dept. of Physics; Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Univ. de Los Andes, Bogota (Colombia)
  2. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials and Dept. of Applied Physics
  3. Federal Inst. of Technology, Zurich (Switzerland). Materials Theory
  4. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Ecole Superieure de Physique et de Chimie Industrielles, Rue Vauquelin, Paris (France). LPEM (UPMC-CNRS)
  7. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
We present a combined experimental and theoretical study of the evolution of the Fermi surface of the anomalous superconductor Pb1-xTlxTe as a function of thallium concentration, drawing on a combination of magnetotransport measurements (Shubnikov–de Haas oscillations and the Hall coefficient), angle resolved photoemission spectroscopy, and density functional theory calculations of the electronic structure. Our results indicate that for Tl concentrations beyond a critical value, the Fermi energy coincides with resonant impurity states in Pb1-xTlxTe , and we rule out the presence of an additional valence band maximum at the Fermi energy. Finally, a comparison to nonsuperconducting Pb1-xNaxTe implies that the presence of these impurity states at the Fermi energy provides the enhanced pairing interaction and thus also the anomalously high temperature superconductivity in this material.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
European Union (EU); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
89233218CNA000001; AC02-05CH11231; AC02-07CH11358
OSTI ID:
1487219
Alternate ID(s):
OSTI ID: 1505999
OSTI ID: 1481940
Report Number(s):
IS-J--9824; LA-UR--17-30756
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 121; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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