Physics – Condensed Matter – Superconductivity
Scientific paper
2004-02-12
Phys. Rev. B 70, 094522 (2004)
Physics
Condensed Matter
Superconductivity
6 pages, 4 eps-figures
Scientific paper
10.1103/PhysRevB.70.094522
One of the most remarkable properties of the high-temperature superconductors is a pseudogap regime appearing in the underdoped cuprates above the superconducting transition temperature T_c. The pseudogap continously develops out of the superconducting gap. In this paper, we demonstrate by means of a detailed comparison between theory and experiment that the characteristic change of quasiparticle dispersion in crossing T_c in the underdoped cuprates can be understood as being due to phase fluctuations of the superconducting order parameter. In particular, we show that within a phase fluctuation model the characteristic back-turning BCS bands disappear above T_c whereas the gap remains open. Furthermore, the pseudogap rather has a U-shape instead of the characteristic V-shape of a d_{x^2-y^2}-wave pairing symmetry and starts closing from the nodal k=(pi/2,pi/2) directions, whereas it rather fills in at the anti-nodal k=(pi,0) regions, yielding further support to the phase fluctuation scenario.
Borisenko S. V.
Eckl Thomas
Fink Joerg
Hanke Werner
Kim Taejoon
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