Issue Eur. Phys. J. B Volume 66, Number 4, December II 2008 Page(s) 461 - 466 Section Solid State and Materials DOI 10.1140/epjb/e2008-00450-0 Published online 12 December 2008

Eur. Phys. J. B 66, 461-466 (2008)
DOI: 10.1140/epjb/e2008-00450-0

Asymmetric superconducting gap and DDW state in high-T_c cuprates

M. Gomes and Angsula Ghosh

Departamento de Física, UFAM, 3000-Japiim, 69077-000 Manaus, AM, Brazil

angsula@ufam.edu.br

Received 4 August 2008 / Received in final form 21 October 2008 / Published online 12 December 2008

Abstract
The asymmetric gap superconductivity is considered in orthorhombic high T_c cuprates. Recent experiments predict an anisotropy in the gap where and the gap node deviates from the diagonal direction toward the k_x axis. The temperature dependencies of the specific heat and penetration depth along the a and b directions are calculated for the anisotropic gap superconductors. However, the anisotropy in the penetration depth can be consistent with the experimental observations only after the inclusion of the plane and chain coupling. The d-density wave (DDW) phase that explains the pseudogap has also been considered to study the phase diagrams of the cuprates.

PACS
74.25.Bt - Thermodynamic properties.
74.72.Bk - Y-based cuprates.
74.45.+c - Proximity effects; Andreev effect; SN and SNS junctions.
74.20.-z - Theories and models of superconducting state.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2008

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