Comments on Superconducting Fluctuation and Transport Phenomena in a Quasi-2D Electronic System (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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Sato and the present authors have developed a theory where effects of the 2D superconducting fluctuations in a weak coupling case on the Cooper pairing susceptibility x(q, ω) and the single particle Green's function are examined by taking account of the most divergent contributions to those. It has been shown that x(0, 0) diverges as T^<(-T_F/2T)>/log|T_F/T| at T → 0, where T and T_F are temperature and the Fermi temperature, respectively. In the present study, we extend the theory to be applied to strong coupling cases and examine roles of the weak three dimentionality leading to a finite value of superconducting transition temperature T_c. We show that T_c is more strongly suppressed in a stronger coupling case. We also examine effects of 2D superconducting fluctuations on the electrical conductivity and show that both of self-energy corrections leading to the pseudogap and vertex corrections such as the Aslamasov-Larkin and the Maki-Thompson terms play their own crucial roles to determine the critical behaviours.
社団法人日本物理学会の論文
2003-05-15