Size-dependent superconductivity of Pb islands under magnetic fields studied by low-temperature scanning tunneling microscopy/spectroscopy

Takahiro Nishio, Masanori Ono, Toyoaki Eguchi, Hideaki Sakata, Yukio Hasegawa

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Using a low-temperature scanning tunneling microscope, we investigated the superconducting gap of single-crystalline Pb islands, approximately 100nm in diameter with 11-13 monolayers (3-4nm) in thickness, under magnetic fields. The superconducting gap was observed under magnetic fields up to 2.2 T, higher than the critical field of bulk Pb. The critical fields of the Pb islands were evaluated from the magnetic field dependence of the zero-bias conductances. We found that the critical field depends on the volume V of the Pb islands as V1/2.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume46
Issue number36-40
DOIs
Publication statusPublished - 2007 Oct 12
Externally publishedYes

Keywords

  • Pb
  • Scanning tunneling microscopy
  • Scanning tunneling spectroscopy
  • Superconductivity

ASJC Scopus subject areas

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

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