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Andreev and Single Particle Tunneling Spectroscopies in Underdoped Cuprates

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arxiv 1005.3441 v2 pith:MSB5ROKK submitted 2010-05-19 cond-mat.supr-con

Andreev and Single Particle Tunneling Spectroscopies in Underdoped Cuprates

classification cond-mat.supr-con
keywords tunnelingandreevassociatedenergylimitparticlesinglespectra
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study tunneling spectroscopy between a normal metal and underdoped cuprate superconductor modeled by a phenomenological theory in which the pseudogap is a precursor to the undoped Mott insulator. In the transparent tunneling limit, the spectra show a small energy gap associated with Andreev reflection. In the Giaever limit, the spectra show a large energy gap associated with single particle tunneling. Our theory semi-quantitatively describes the two gap behavior observed in tunneling experiments.

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