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arXiv 1607.02162cond-mat.supr-con
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金属硫化氢在225 gpa压力下的临界温度

Metal hydrogen sulfide critical temperature at the pressure 225 gpa

Nikolay Kudryashov, Alexander Kutukov, Evgeny Mazur

摘要:

将Éliashberg理论推广到电子态密度不恒定的电子-声子(EP)系统,以及电子质量和化学势重整化的频率行为,研究了压力下的硫化氢相.考虑声子对反常电子格林函数的贡献。配对被认为是在整个宽度的电子带,而不仅仅是在一个狭窄的层在费米表面。利用计算得到的电子质量重整化ReZ、EP相互作用重整化的电子态密度和电子-声子相互作用谱函数的频率和温度依赖关系,计算了电子反常GF。求解了变电子态密度的Éliashberg广义方程。得到了相位中序参量的实部和虚部对频率的依赖关系。在压力P = 225 GPa的硫化氢相的值已被定义。

英文摘要:

Éliashberg theory, being generalized to the electron-phonon (EP) systems with not constant density of electronic states, as well as to the frequency behavior of the renormalization of both the electron mass and the chemical potential, is used to study hydrogen sulphide phase under pressure. The phonon contribution to the anomalous electron Green's function (GF) is considered. The pairing is considered within the overall width of the electron band, and not only in a narrow layer at the Fermi surface. The frequency and the temperature dependences of the electron mass renormalization ReZ , the density of electronic states , renormalized by the EP interaction , the spectral function of the electron-phonon interaction, obtained by calculation are used to calculate the electronic abnormal GF. The Éliashberg generalized equations with the variable density of electronic states are resolved. The dependence of both the real and the imaginary part of the order parameter on the frequency in the phase is obtained. The value in the hydrogen sulfide phase at the pressure P = 225 GPa has been defined.

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