Superconducting gap in polycrystalline MgB2 studied by electron tunneling

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

Research output: Contribution to journalArticle

16 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

Fingerprint

Electron tunneling
electron tunneling
Superconductivity
Superconducting materials
superconductivity

Keywords

  • Break junction
  • MgB
  • Tunneling spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Superconducting gap in polycrystalline MgB2 studied by electron tunneling. / Takasaki, T.; Ekino, T.; Muranaka, T.; Fujii, H.; Akimitsu, Jun.

In: Physica C: Superconductivity and its Applications, Vol. 378-381, No. PART 1, 01.10.2002, p. 229-233.

Research output: Contribution to journalArticle

Takasaki, T. ; Ekino, T. ; Muranaka, T. ; Fujii, H. ; Akimitsu, Jun. / Superconducting gap in polycrystalline MgB2 studied by electron tunneling. In: Physica C: Superconductivity and its Applications. 2002 ; Vol. 378-381, No. PART 1. pp. 229-233.
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