Doping-induced change in the interlayer yransport mechanism of Bi2Sr2CaCu2O8+δ near the superconducting transition temperature
2008 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 101, no 8, 087003- p.Article in journal (Refereed) Published
We perform a detailed study of temperature, bias, and doping dependence of interlayer transport in the layered high temperature superconductor Bi2Sr2CaCu2O8+delta. We observe that the shape of interlayer characteristics in underdoped crystals exhibits a remarkable crossover at the superconducting transition temperature: from thermal activation-type above Tc to almost T-independent quantum tunneling-type below Tc. Our data provide insight into the nature of interlayer transport and indicate that its mechanism changes with doping: from the conventional single quasiparticle tunneling in overdoped to a progressively increasing Cooper pair contribution in underdoped crystals.
Place, publisher, year, edition, pages
2008. Vol. 101, no 8, 087003- p.
Research subject Physics
IdentifiersURN: urn:nbn:se:su:diva-14611DOI: 10.1103/PhysRevLett.101.087003ISI: 000258643600060PubMedID: 18764651OAI: oai:DiVA.org:su-14611DiVA: diva2:181131