Andreev reflections in the pseudogap state of cuprate superconductors

Article

关键词: D-WAVE SUPERCONDUCTORS;    HIGH-TEMPERATURE SUPERCONDUCTORS;    DENSITY-OF-STATES;    TUNNELING SPECTROSCOPY;    PHASE FLUCTUATIONS;    VORTEX;    GAP;    TRANSITION;    FILMS;   

DOI  :  10.1103/PhysRevB.61.9748

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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