Self-Consistent Consideration of Fluctuations in Singlet Superconducting Phases with s and d Symmetryстатья
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Дата последнего поиска статьи во внешних источниках: 25 ноября 2020 г.
Аннотация:We analyze the behavior of thermal fluctuations of the superconducting order parameter withextended s-wave and d 2 2 -wave symmetry. For this purpose, we develop a method of self-consistent con-x − ysideration of the order parameter fluctuations and charge carrier scatterers by fluctuations of coupled electronpairs using the theory of functional integration. The study is performed based on the quasi-two-dimensionalone-band model with attraction between electrons located at neighboring sites. We obtain the distributionfunctions of the phase fluctuation probabilities depending on temperature, charge carrier concentrations, andmodel parameters. It is shown that the phase of the order parameter in the superconducting region is coher-ent, and the density of states has a dip at the Fermi level. In approaching the incoherent region of the phasediagram, the dip in the density of states disappears simultaneously with the loss of phase coherence. At thesame time, the order parameter amplitude averaged over fluctuations remains finite at any temperature andconcentration of charge carriers. Our results show that the pseudogap state cannot be explained in the framesof this scenario.