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首页> 外文期刊>Journal of Applied Physics >Electron-phonon superconductivity in LaO0.5F0.5BiSe2
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Electron-phonon superconductivity in LaO0.5F0.5BiSe2

机译:LaO0.5F0.5BiSe2中的电子声子超导

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摘要

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 LaO0.5F0.5BiS2, this compound is also a conventional electron-phonon coupling induced superconductor.
机译:我们报告了新发现的超导体LaO0.5F0.5BiSe2的电子结构,费米表面,声子谱和电子-声子耦合的密度泛函计算。可以确定的是,在(π,π,0)处有很强的费米表面嵌套,这会导致不稳定的声子分支。结合冻结的声子总能量计算和非谐振荡器模型,我们发现,量子涨落阻止了静态长程阶跃的出现。计算表明,LaO0.5F0.5BiSe2具有高度的各向异性,并且与其表亲LaO0.5F0.5BiS2相同,该化合物也是常规的电子-声子耦合诱导超导体。

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