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Size of the BCS ratio in strongly underdoped high-Tc cuprates

Phys. Rev. B 55, R6149(R) – Published 1 March 1997
A. A. Abrikosov

Abstract

An explanation is proposed of the huge (over 20) BCS ratio 2Δ(0)/Tc discovered recently in strongly underdoped Bi2 Sr2 CaCu2 O8-δ . Since no marked shrinking of the Fermi surface was found, our explanation is based on the idea of disruption of the connection between CuO2 bilayers due to reduction of localized centers providing resonant tunneling between the layers. An increase of phase fluctuations of the order parameter, mostly due to spontaneous vortex formation, leads to a possibility of a drastic reduction of Tc, which practically coincides with TBKT, the temperature of the Berezinsky-Kosterlitz-Thouless transition. At the same time, the local energy gap is likely to undergo no major changes. An argument is given why at not too small concentrations of the localized centers the critical temperature can remain rather stable, despite strong variations in the normal c-axis conductivity.

DOI: http://dx.doi.org/10.1103/PhysRevB.55.R6149

© 1997 The American Physical Society

Authors & Affiliations

A. A. Abrikosov

  • Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439

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