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TT: Tiefe Temperaturen

TT 10: Supraleitung: Theorie

TT 10.4: Talk

Tuesday, March 12, 2002, 11:00–11:15, H18

Pair Phase Fluctuations and the Pseudogap — •Thomas Eckl¹, Douglas J. Scalapino², Enrico Arrigoni¹, and Werner Hanke¹ — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — ²Department of Physics, University of California, Santa Barbara, CA 93106-9530 USA

The single-particle density of states and the tunneling conductance are studied for a two-dimensional BCS-like Hamiltonian with a d_x²−y²-gap and phase fluctuations. The latter are treated by a classical Monte Carlo simulation of an XY model. Comparison of our results with recent scanning tunneling spectra of Bi-based high-T_c cuprates supports the idea that the pseudogap behavior observed in these experiments can be understood as arising from phase fluctuations of a d_x²−y² pairing gap whose amplitude forms on an energy scale set by T_c^MF well above the actual superconducting transition.