Will there be Andreev reflections in the pseudogap state of cuprate supercondcutors?

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  • 9 February 1999
Abstract
We show 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 (AR) from these pairs even above the superconducting transition temperature, T_c. After presenting qualitative arguments for this effect, we quantify our results with detailed calculations based on the Bogoliubov-de Gennes equation. Experimental observations of the effects of AR above T_c - such as a zero bias conductance peak in the tunneling conductance along the copper oxide plane - could provide unambiguous evidence for the preformed pairs in the pseudogap state.

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