Quantum fluctuations of a superconductor order parameter

Kostantin Arutyunov, Janne Lehtinen

Research output: Contribution to journalArticleScientificpeer-review

3 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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language = "English",
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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 -