How Much Phase Coherence Does a Pseudogap Need?

Details How Much Phase Coherence Does a Pseudogap Need? How Much Phase Coherence Does a Pseudogap Need?

2001-08-08

arxiv.org/abs/cond-mat/0108146v1

Physics

Condensed Matter

Superconductivity

RevTeX, 4 pages, 5 embedded PostScript figures

Scientific paper

It has been suggested that the ``pseudogap'' regime in cuprate superconductors, extending up to hudreds of degrees into the normal phase, reflects an incoherent d-wave pairing, with local superconducting order coherent over a finite length scale $\xi$, insufficient to establish superconductivity. We calculate the single-particle spectral density in such a state from a minimal phenomenological disordered BCS model. When the phase-coherence length exceeds the Cooper pair size, a clear pseudogap appears. The pseudogap regime, however, is found only over a relatively narrow range of phase stiffnesses, hence is not expected to extend more than about 20% above $T_c$.

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