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Title: Electron-phonon superconductivity in LaO{sub 0.5}F{sub 0.5}BiSe{sub 2}

We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum and electron–phonon coupling for the newly discovered superconductor LaO{sub 0.5}F{sub 0.5}BiSe{sub 2}. It is confirmed that there is a strong Fermi surface nesting at (π,π,0), which results in unstable phonon branches. Combining the frozen phonon total energy calculations and an anharmonic oscillator model, we find that the quantum fluctuation prevents the appearance of static long–range order. The calculation shows that LaO{sub 0.5}F{sub 0.5}BiSe{sub 2} is highly anisotropic, and same as its cousin LaO{sub 0.5}F{sub 0.5}BiS{sub 2}, this compound is also a conventional electron-phonon coupling induced superconductor.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [2] ;  [4]
  1. Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)
  2. Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200062 (China)
  3. Department of Physics, University of California, Davis, One Shields Avenue, Davis, California 95616 (United States)
  4. (China)
Publication Date:
OSTI Identifier:
22304010
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANHARMONIC OSCILLATORS; ANISOTROPY; BISMUTH COMPOUNDS; DENSITY FUNCTIONAL METHOD; ELECTRONIC STRUCTURE; ELECTRON-PHONON COUPLING; FERMI LEVEL; FLUCTUATIONS; FLUORINE COMPOUNDS; LANTHANUM COMPOUNDS; OXYGEN COMPOUNDS; SELENIUM COMPOUNDS; SPECTRA; SUPERCONDUCTIVITY; SUPERCONDUCTORS