Electron-phonon superconductivity in LaO{sub 0.5}F{sub 0.5}BiSe{sub 2}
- Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)
- Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200062 (China)
- Department of Physics, University of California, Davis, One Shields Avenue, Davis, California 95616 (United States)
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.
- OSTI ID:
- 22304010
- Journal Information:
- Journal of Applied Physics, Vol. 115, Issue 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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