Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 2: Supraleitung: Mechanismen, Phasendiagramm, konkurrierende Ordnungen
TT 2.5: Vortrag
Montag, 8. März 2004, 12:30–12:45, H20
Precursor effects above Tc of the No-dqidealNo-dq superconducting state within a phase fluctuation model for the underdoped cuprates — •Thomas Eckl1, Werner Hanke1, Enrico Arrigoni1, and Douglas J. Scalapino2 — 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 phase fluctuation scenario for the underdoped (UD) cuprates is based on the idea that the pseudogap originates from phase fluctuations of a dx2−y2 pairing gap, whose amplitude forms at TcMF, well above the actual superconducting (SC) transition at Tc. Recently, we have shown that a phenomenological model for phase fluctuations can account for different single-particle properties of the pseudogap state. Here we discuss precursor effects of the ideal SC state above Tc within our phenomenological phase fluctuation model. In particular, the paraconductivity and the fluctuating diamagnetism above Tc in the pseudogap state are analyzed and the temperature scale at which these effects become visible in experiment discussed.
[1] T. Eckl, D. J. Scalapino, E. Arrigoni, and W. Hanke, Phys. Rev. B 66, 140510(R) (2002)
[2] T. Eckl, W. Hanke and E. Arrigoni, Phys. Rev. B 68, 014505 (2003)