Andreev reflections in the pseudogap state of cuprate supercondcutors

Details Andreev reflections in the pseudogap state of cuprate supercondcutors Andreev reflections in the pseudogap state of cuprate supercondcutors

1999-02-09

arxiv.org/abs/cond-mat/9902125v2

Physical Review B 61, 9748 (2000)

Physics

Condensed Matter

Superconductivity

5 pages, 1 figure

Scientific paper

10.1103/PhysRevB.61.9748

We propose that, if the pseudogap state in the cuprate superconductors can be described in terms of the phase-incoherent preformed pairs, there should exist Andreev reflection from these pairs even above the superconducting transition temperature, $T_c$. After giving qualitative arguments for this effect, we present more quantitative calculations based on the Bogoliubov--de Gennes equation. Experimental observations of the effects of Andreev reflections above $T_c$---such as an enhanced tunneling conductance below the gap along the copper oxide plane---could provide unambiguous evidence for the preformed pairs in the pseudogap state.

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