Nucleation of superconductivity in a thin film with a lattice of circular holes

A. Bezryadin, B. Pannetier

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate experimentally the nucleation of superconductivity in a thin Aluminium film with a square lattice of microholes in a uniform perpendicular magnetic field H. It is shown that in a non-zero magnetic field, this system has an elevated critical temperature Tc*(H) in comparison to the reference film without holes. This effect can be considered as a generalisation of the well known surface superconductivity effect for the case of a finite radius of the surface and a multiply connected geometry of the sample. Quantization of the fluxoid around each hole leads to oscillations in the Tc*(H) dependence with a period approximately corresponding to one flux quantum through a hole. Also another type of oscillation with a smaller period which is equal to one flux quantum per unit cell was observed. We discuss the second type of oscillation in terms of an interaction between the holes. We believe that our results can be useful in the analysis of high-Tc superconductors with columnar defects because, as it is shown here, a comparison of the Tc(H) dependence before and after irradiation can give some special information on the properties of the amorphous tracks produced by highenergy ions. While many experimental parameters are different in our system and in HTSC we present arguments why this analogy should be correct.

Original languageEnglish (US)
Pages (from-to)251-268
Number of pages18
JournalJournal of Low Temperature Physics
Volume98
Issue number3-4
DOIs
StatePublished - Feb 1995
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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