Abstract
Neutron crystal-field spectroscopy experiments in optimally doped La1.81Sr0.15Ho0.04CuO4 and in slightly underdoped HoBa2Cu4O8 high-temperature superconductors are presented. By this bulk-sensitive technique, information on the gap function is obtained from the relaxation behaviour 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 distinct anomalies at the pseudogap temperature T * where the pairing of the charge carriers occurs, as well as at the superconducting transition temperature T c where long-range phase coherence sets in. Our results are compatible with an unusual temperature dependence of the gap function in the pseudogap region (T c ≤ T ≤ T *), i.e., a breakup of the Fermi surface into disconnected arcs. Moreover, the relaxation data 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%.
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Furrer, A. (2007). Admixture of an s-Wave Component to the d-Wave Gap Symmetry in High-Temperature Superconductors. In: Bussmann-Holder, A., Keller, H. (eds) High Tc Superconductors and Related Transition Metal Oxides. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-71023-3_10
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DOI: https://doi.org/10.1007/978-3-540-71023-3_10
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