Superconductivity in K3C60 and Rb3C60 surfaces

LH Tjeng*, R Hesper, A Heeres, GA Sawatzky

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    We present a detailed investigation of the surface electronic structure of solid K;CM, and Rb3C60 in connection with their electronic transport properties. The best conducting samples with the highest superconducting transition temperature T, have the highest density of states at the Fermi level as measured by photoemission, but the valence of the CM ions at the surface deviates appreciable from the 3- bulk value, namely 2.5- or even 1.5- depending on the preparation procedure. Despite the large discrepancy in the electronic structure, we find, using ultra-high resolution photoemission, that these surfaces have a BCS-like superconducting gap A which is not reduced from the bulk value, i.e. close to the weak coupling 2Delta/k(B)T(i) = 3.53 value.

    Original languageEnglish
    Title of host publicationELECTRONIC PROPERTIES OF MOLECULAR NANOSTRUCTURES
    EditorsH Kuzmany, J Fink, M Mehring, S Roth
    Place of PublicationMELVILLE
    PublisherAMER INST PHYSICS
    Pages122-126
    Number of pages5
    ISBN (Print)0-7354-0033-4
    Publication statusPublished - 2001
    Event15th International Winter School on Electronic Properties on Novel Materials - , Austria
    Duration: 3-Mar-200110-Mar-2001

    Publication series

    NameAIP CONFERENCE PROCEEDINGS
    PublisherAMER INST PHYSICS
    Volume591
    ISSN (Print)0094-243X

    Other

    Other15th International Winter School on Electronic Properties on Novel Materials
    CountryAustria
    Period03/03/200110/03/2001

    Keywords

    • ELECTRON-TUNNELING SPECTROSCOPY
    • NUCLEAR-MAGNETIC-RESONANCE
    • SINGLE-CRYSTALLINE RB3C60
    • ENERGY-GAP
    • DOPED C-60
    • FULLERIDES
    • FULLERENES
    • PHONON

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