Superconducting gap anisotropy within the framework of a simple exchange model for layered cuprates. The theory of HTSC

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dc.creatorMishonov, T. M.
dc.creatorDonkov, A. A.
dc.creatorKoleva, R. K.
dc.creatorPenev, E. S.
dc.date2000-01-04
dc.date.accessioned2026-07-07T02:36:25Z
dc.date.available2026-07-07T02:36:25Z
dc.descriptionThe oxygen O2p_sigma and copper Cu4s and Cu3d_x^2-y^2 orbitals are involved in a simple LCAO model for determination of the conduction band and the oxygen-oxygen hopping is considered as a small parameter with respect to the transition amplitude between nearest neighbours. The traditional Cooper pairing is obtained by taking into account the double-electron exchange between the nearest neighbours within the two-dimensional CuO_2 plane. The equation for the superconducting gap is obtained as a result of the standard BCS treatment. It is shown that the order parameter could have either s-type or d-type symmetry depending on the ratio between the transition amplitudes. This model allows understanding the experiments reporting a pi-shift of the Josephson phase indicative for a d-type gap symmetry as well as the observed s-type in the case of strongly irradiated samples.
dc.description11 pages, 1 figure, published in Bbulgarian Journal of Physics
dc.identifierhttps://arxiv.org/abs/cond-mat/0001033
dc.identifierhttp://arxiv.org/abs/cond-mat/0001033
dc.identifierBulgarian Journal of Physics Vol. 24, Nos 3/4 (1997), pp. 114-125
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/15913
dc.subjectSuperconductivity
dc.titleSuperconducting gap anisotropy within the framework of a simple exchange model for layered cuprates. The theory of HTSC
dc.typetext

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