Quantum fluctuations of a superconductor order parameter

Kostantin Arutyunov, Janne Lehtinen

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)

    Abstract

    Tunneling I-V characteristics between very narrow titanium nanowires and "massive" superconducting aluminum were measured. The clear trend was observed: the thinner the titanium electrode, the broader the singularity at eV = [delta]1(Al)+[delta]2(Ti). The phenomenon can be explained by broadening of the gap edge of the quasi-one-dimensional titanium channels due to quantum fluctuations of the order parameter modulus |?2|. The range of the nanowire diameters, where the effect is pronounced, correlates with dimensions where the phase fluctuations of the complex superconducting order parameter [delta] = |[delta]|ei[phi], the quantum phase slips, broadening the R(T) dependencies, have been observed.
    Original languageEnglish
    JournalNanoscale Research Letters
    Volume11
    Issue number364
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Titanium
    Superconducting materials
    Nanowires
    titanium
    nanowires
    Aluminum
    Electrodes
    slip
    aluminum
    trends
    electrodes

    Keywords

    • quasi-one-dimensional superconductivity
    • quantum fluctuations
    • tunneling

    Cite this

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    title = "Quantum fluctuations of a superconductor order parameter",
    abstract = "Tunneling I-V characteristics between very narrow titanium nanowires and {"}massive{"} superconducting aluminum were measured. The clear trend was observed: the thinner the titanium electrode, the broader the singularity at eV = [delta]1(Al)+[delta]2(Ti). The phenomenon can be explained by broadening of the gap edge of the quasi-one-dimensional titanium channels due to quantum fluctuations of the order parameter modulus |?2|. The range of the nanowire diameters, where the effect is pronounced, correlates with dimensions where the phase fluctuations of the complex superconducting order parameter [delta] = |[delta]|ei[phi], the quantum phase slips, broadening the R(T) dependencies, have been observed.",
    keywords = "quasi-one-dimensional superconductivity, quantum fluctuations, tunneling",
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    Quantum fluctuations of a superconductor order parameter. / Arutyunov, Kostantin; Lehtinen, Janne.

    In: Nanoscale Research Letters, Vol. 11, No. 364, 2016.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Quantum fluctuations of a superconductor order parameter

    AU - Arutyunov, Kostantin

    AU - Lehtinen, Janne

    PY - 2016

    Y1 - 2016

    N2 - Tunneling I-V characteristics between very narrow titanium nanowires and "massive" superconducting aluminum were measured. The clear trend was observed: the thinner the titanium electrode, the broader the singularity at eV = [delta]1(Al)+[delta]2(Ti). The phenomenon can be explained by broadening of the gap edge of the quasi-one-dimensional titanium channels due to quantum fluctuations of the order parameter modulus |?2|. The range of the nanowire diameters, where the effect is pronounced, correlates with dimensions where the phase fluctuations of the complex superconducting order parameter [delta] = |[delta]|ei[phi], the quantum phase slips, broadening the R(T) dependencies, have been observed.

    AB - Tunneling I-V characteristics between very narrow titanium nanowires and "massive" superconducting aluminum were measured. The clear trend was observed: the thinner the titanium electrode, the broader the singularity at eV = [delta]1(Al)+[delta]2(Ti). The phenomenon can be explained by broadening of the gap edge of the quasi-one-dimensional titanium channels due to quantum fluctuations of the order parameter modulus |?2|. The range of the nanowire diameters, where the effect is pronounced, correlates with dimensions where the phase fluctuations of the complex superconducting order parameter [delta] = |[delta]|ei[phi], the quantum phase slips, broadening the R(T) dependencies, have been observed.

    KW - quasi-one-dimensional superconductivity

    KW - quantum fluctuations

    KW - tunneling

    U2 - 10.1186/s11671-016-1582-7

    DO - 10.1186/s11671-016-1582-7

    M3 - Article

    VL - 11

    JO - Nanoscale Research Letters

    JF - Nanoscale Research Letters

    SN - 1931-7573

    IS - 364

    ER -