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

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

2007-08-03

arxiv.org/abs/0708.0524v1

J. Supercond. Nov. Magn. (2008) 21: 1-5

Physics

Condensed Matter

Superconductivity

14 pages, 3 figures, 1 table; accepted for publication in J. Supercond. Nov. Magn

Scientific paper

10.1007/s10948-007-0236-5

Neutron 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

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