Journal
PHYSICAL REVIEW B
Volume 61, Issue 14, Pages 9748-9751Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.61.9748
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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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