Admixture of an s-wave component to the d-wave gap symmetry in high-temperature superconductors

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dc.creatorFurrer, A.
dc.date2007-08-03
dc.date.accessioned2026-07-07T08:52:29Z
dc.date.available2026-07-07T08:52:29Z
dc.descriptionNeutron crystal-field spectroscopy experiments in the Y- and La-type high-temperature superconductors HoBa2Cu3O6.56, HoBa2Cu4O8, and La1.81Sr0.15Ho0.04CuO4 are reviewed. By this bulk-sensitive technique, information on the gap function is obtained from the relaxation behavior of crystal-field transitions associated with the Ho3+ ions which sit as local probes close to the superconducting copper-oxide planes. The relaxation data exhibit a peculiar change from a convex to a concave shape between the superconducting transition temperature Tc and the pseudogap temperature T* which can only be modelled satisfactorily if the gap function of predominantly d-wave symmetry includes an s-wave component of the order of 20-25%, independent of the doping level. Moreover, our results are compatible with an unusual temperature dependence of the gap function in the pseudogap region (Tc<T<T*), i.e., a breakup of the Fermi surface into disconnected arcs.
dc.description14 pages, 3 figures, 1 table; accepted for publication in J. Supercond. Nov. Magn
dc.identifierhttps://arxiv.org/abs/0708.0524
dc.identifierhttp://arxiv.org/abs/0708.0524
dc.identifierJ. Supercond. Nov. Magn. (2008) 21: 1-5
dc.identifierdoi:10.1007/s10948-007-0236-5
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/145292
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleAdmixture of an s-wave component to the d-wave gap symmetry in high-temperature superconductors
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