Superconducting gap in polycrystalline MgB2 studied by electron tunneling

T. Takasaki, T. Ekino, T. Muranaka, H. Fujii, J. Akimitsu

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Electron-tunneling measurements on the new superconductor MgB2 with Tc = 39 K have been carried out using a break-junction technique. The measurements reveal the largest gap value of 2Δ = 17-19 meV at 4.2 K. This value leads to the ratio 2Δ/kBTc = 5-5.6, indicating the strong-coupling superconductivity. We have also observed the reproducible gap values of 2Δ ≅ 4-4.5 meV and 7-9 meV. The smallest gap exists even beyond 30 K. We will discuss the implication of the data.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - Oct 1 2002
Externally publishedYes

Keywords

  • Break junction
  • MgB
  • Tunneling spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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