title: Nearly free electrons in the layered oxide superconductor Ag5Pb2O6.
abstract: We present first measurements of quantum oscillations in the layered oxide superconductor Ag5Pb2O6. From a detailed angular and temperature dependent study of the de Haas-van Alphen effect we determine the electronic structure and demonstrate that the electron masses are very light, m* approximately 1.2me. The Fermi surface we observe is essentially that expected of nearly free electrons--establishing Ag5Pb2O6 as the first known example of a monovalent, nearly free electron superconductor at ambient pressure.
authors.affiliation: Cavendish Laboratory, University of Cambridge, United Kingdom.
authors.forename: Mike
authors.initials: M
authors.lastname: Sutherland
authors.forename: Peter D A
authors.initials: PD
authors.lastname: Mann
authors.forename: Christoph
authors.initials: C
authors.lastname: Bergemann
authors.forename: Shingo
authors.initials: S
authors.lastname: Yonezawa
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Maeno