Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 408, Issue -, Pages 405-409Publisher
ELSEVIER
DOI: 10.1016/j.physc.2004.03.005
Keywords
interlayer tunneling; pseudo-gap; critical doping point
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Layered structure of Bi-2212 high T-c superconductor (HTSC), provides a unique opportunity to probe quasiparticle density of states inside a bulk single crystal by means of intrinsic (interlayer) tunneling spectroscopy. Here I present a systematic study of intrinsic tunneling characteristics of Bi-2212 as a function of doping, temperature, magnetic field and intercalation. An improved resolution made it possible to simultaneously trace the superconducting gap (SG) and the normal state pseudo-gap (PG) in a close vicinity of T-c and to analyze closing of the PG at T-*. The obtained doping phase diagram exhibits a critical doping point for appearance of the PG and a characteristic crossing of the SG and the PG close to the optimal doping. All this points towards coexistence of two different and competing order parameters in Bi-2212. (C) 2004 Elsevier B.V. All rights reserved.
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