Electron-phonon superconductivity in LaO0.5F 0.5BiSe2

Yanqing Feng; Hang Chen Ding; Yongping Du; Xiangang Wan; Bogen Wang; Sergey Y. Savrasov; Chun Gang Duan

doi:10.1063/1.4883755

Electron-phonon superconductivity in LaO_0.5F _0.5BiSe₂

Yanqing Feng
, Hang Chen Ding
, Yongping Du
, Xiangang Wan^*
, Bogen Wang
, Sergey Y. Savrasov
, Chun Gang Duan

^*Corresponding author for this work

School of Physics and Electronic Science

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum and electron-phonon coupling for the newly discovered superconductor LaO_0.5F_0.5BiSe₂. 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_0.5F_0.5BiSe₂ is highly anisotropic, and same as its cousin LaO_0.5F_0.5BiS ₂, this compound is also a conventional electron-phonon coupling induced superconductor.

Original language	English
Article number	233901
Journal	Journal of Applied Physics
Volume	115
Issue number	23
DOIs	https://doi.org/10.1063/1.4883755
State	Published - 21 Jun 2014

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title = "Electron-phonon superconductivity in LaO0.5F 0.5BiSe2",

abstract = "We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum and electron-phonon coupling for the newly discovered superconductor LaO0.5F0.5BiSe2. 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 LaO0.5F0.5BiSe2 is highly anisotropic, and same as its cousin LaO0.5F0.5BiS 2, this compound is also a conventional electron-phonon coupling induced superconductor.",

author = "Yanqing Feng and Ding, \{Hang Chen\} and Yongping Du and Xiangang Wan and Bogen Wang and Savrasov, \{Sergey Y.\} and Duan, \{Chun Gang\}",

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T1 - Electron-phonon superconductivity in LaO0.5F 0.5BiSe2

AU - Feng, Yanqing

AU - Ding, Hang Chen

AU - Du, Yongping

AU - Wan, Xiangang

AU - Wang, Bogen

AU - Savrasov, Sergey Y.

AU - Duan, Chun Gang

PY - 2014/6/21

Y1 - 2014/6/21

N2 - We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum and electron-phonon coupling for the newly discovered superconductor LaO0.5F0.5BiSe2. 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 LaO0.5F0.5BiSe2 is highly anisotropic, and same as its cousin LaO0.5F0.5BiS 2, this compound is also a conventional electron-phonon coupling induced superconductor.

AB - We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum and electron-phonon coupling for the newly discovered superconductor LaO0.5F0.5BiSe2. 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 LaO0.5F0.5BiSe2 is highly anisotropic, and same as its cousin LaO0.5F0.5BiS 2, this compound is also a conventional electron-phonon coupling induced superconductor.

UR - https://www.scopus.com/pages/publications/84903151615

U2 - 10.1063/1.4883755

DO - 10.1063/1.4883755

M3 - 文章

AN - SCOPUS:84903151615

SN - 0021-8979

VL - 115

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 23

M1 - 233901

ER -

Electron-phonon superconductivity in LaO_0.5F _0.5BiSe₂

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