PHONON STRUCTURE AND PROXIMITY-EFFECT TUNNELLING IN STRONGLY GAPLESS SUPERCONDUCTORS.

B. F. Donovan-Vojtovic, Ivan Schuller, P. M. Chaikin

    Research output: Contribution to journalArticle

    Abstract

    The tunnelling characteristics of normal-metal-insulator-superconductor (NIS) and NINS junctions in the presence of a parallel magnetic field larger than the bulk critical field have been measured. The state that results from this surface superconductivity is gapless. By comparing data taken with no applied field and above H//c//2, the strong coupling effects in a superconductor and the interference effects in a proximity sandwich can be studied as the order parameter is varied. For tunnelling into a single superconducting film, the amplitude of the observed phonon structure scales with the order parameter squared. Although surface superconductivity is usually reduced by proximity with a normal metal, the surface sheath remains superconducting for a layer of silver up to similar 800A thick for Ag-Pb sandwiches. For thin silver layers ( similar 200 A), the discrepancy between a simple interference model calculation and the experimental data becomes less as the order parameter is reduced, which implies that the discrepancy arises from multiple Andreev scatterings at the N-S boundary.

    Original languageEnglish (US)
    Pages (from-to)373-383
    Number of pages11
    JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
    Volume39
    Issue number5
    StatePublished - May 1979

    Fingerprint

    Superconducting materials
    Superconductivity
    Silver
    proximity
    superconductivity
    Metals
    silver
    interference
    Superconducting films
    Multiple scattering
    superconducting films
    sheaths
    metals
    insulators
    Magnetic fields
    scattering
    magnetic fields

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Physics and Astronomy(all)

    Cite this

    PHONON STRUCTURE AND PROXIMITY-EFFECT TUNNELLING IN STRONGLY GAPLESS SUPERCONDUCTORS. / Donovan-Vojtovic, B. F.; Schuller, Ivan; Chaikin, P. M.

    In: Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties, Vol. 39, No. 5, 05.1979, p. 373-383.

    Research output: Contribution to journalArticle

    @article{2a22f2a3c4524bbda4a260fbf31f73db,
    title = "PHONON STRUCTURE AND PROXIMITY-EFFECT TUNNELLING IN STRONGLY GAPLESS SUPERCONDUCTORS.",
    abstract = "The tunnelling characteristics of normal-metal-insulator-superconductor (NIS) and NINS junctions in the presence of a parallel magnetic field larger than the bulk critical field have been measured. The state that results from this surface superconductivity is gapless. By comparing data taken with no applied field and above H//c//2, the strong coupling effects in a superconductor and the interference effects in a proximity sandwich can be studied as the order parameter is varied. For tunnelling into a single superconducting film, the amplitude of the observed phonon structure scales with the order parameter squared. Although surface superconductivity is usually reduced by proximity with a normal metal, the surface sheath remains superconducting for a layer of silver up to similar 800A thick for Ag-Pb sandwiches. For thin silver layers ( similar 200 A), the discrepancy between a simple interference model calculation and the experimental data becomes less as the order parameter is reduced, which implies that the discrepancy arises from multiple Andreev scatterings at the N-S boundary.",
    author = "Donovan-Vojtovic, {B. F.} and Ivan Schuller and Chaikin, {P. M.}",
    year = "1979",
    month = "5",
    language = "English (US)",
    volume = "39",
    pages = "373--383",
    journal = "Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties",
    issn = "1364-2812",
    publisher = "Taylor and Francis Ltd.",
    number = "5",

    }

    TY - JOUR

    T1 - PHONON STRUCTURE AND PROXIMITY-EFFECT TUNNELLING IN STRONGLY GAPLESS SUPERCONDUCTORS.

    AU - Donovan-Vojtovic, B. F.

    AU - Schuller, Ivan

    AU - Chaikin, P. M.

    PY - 1979/5

    Y1 - 1979/5

    N2 - The tunnelling characteristics of normal-metal-insulator-superconductor (NIS) and NINS junctions in the presence of a parallel magnetic field larger than the bulk critical field have been measured. The state that results from this surface superconductivity is gapless. By comparing data taken with no applied field and above H//c//2, the strong coupling effects in a superconductor and the interference effects in a proximity sandwich can be studied as the order parameter is varied. For tunnelling into a single superconducting film, the amplitude of the observed phonon structure scales with the order parameter squared. Although surface superconductivity is usually reduced by proximity with a normal metal, the surface sheath remains superconducting for a layer of silver up to similar 800A thick for Ag-Pb sandwiches. For thin silver layers ( similar 200 A), the discrepancy between a simple interference model calculation and the experimental data becomes less as the order parameter is reduced, which implies that the discrepancy arises from multiple Andreev scatterings at the N-S boundary.

    AB - The tunnelling characteristics of normal-metal-insulator-superconductor (NIS) and NINS junctions in the presence of a parallel magnetic field larger than the bulk critical field have been measured. The state that results from this surface superconductivity is gapless. By comparing data taken with no applied field and above H//c//2, the strong coupling effects in a superconductor and the interference effects in a proximity sandwich can be studied as the order parameter is varied. For tunnelling into a single superconducting film, the amplitude of the observed phonon structure scales with the order parameter squared. Although surface superconductivity is usually reduced by proximity with a normal metal, the surface sheath remains superconducting for a layer of silver up to similar 800A thick for Ag-Pb sandwiches. For thin silver layers ( similar 200 A), the discrepancy between a simple interference model calculation and the experimental data becomes less as the order parameter is reduced, which implies that the discrepancy arises from multiple Andreev scatterings at the N-S boundary.

    UR - http://www.scopus.com/inward/record.url?scp=0018466005&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0018466005&partnerID=8YFLogxK

    M3 - Article

    VL - 39

    SP - 373

    EP - 383

    JO - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties

    JF - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties

    SN - 1364-2812

    IS - 5

    ER -