Probing d-wave pairing correlations in the pseudogap regime of the cuprate superconductors via low-energy states near impurities

Details Probing d-wave pairing correlations in the pseudogap regime of the cuprate superconductors via low-energy states near impurities Probing d-wave pairing correlations in the pseudogap regime of the cuprate superconductors via low-energy states near impurities

2001-06-01

arxiv.org/abs/cond-mat/0106026v1

Phys. Rev. B 64, 224518 (2001)

Physics

Condensed Matter

Superconductivity

8 pages, 2 figures

Scientific paper

10.1103/PhysRevB.64.224518

The issue of probing the pseudogap regime of the cuprate superconductors, specifically with regard to the existence and nature of superconducting pairing correlations of d-wave symmetry, is explored theoretically. It is shown that if the d-wave correlations believed to describe the superconducting state persist into the pseudogap regime, but with pair-potential phase-fluctuations that destroy their long-range nature, then the low-energy quasiparticle states observed near extended impurities in the truly superconducting state should also persist as resonances in the pseudogap regime. The scattering of quasiparticles by these phase-fluctuations broadens what was (in the superconducting state) a sharp peak in the single-particle spectral function at low energy, as we demonstrate within the context of a simple model. This peak and its broadening is, in principle, accessible via scanning tunneling spectroscopy near extended impurities in the pseudogap regime. If so, such experiments would provide a probe of the extent to which d-wave superconducting correlations persist upon entering the pseudogap regime, thus providing a stringent diagnostic of the phase-fluctuation scenario.

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