Tunneling measurements of superconducting NbB2

Toshikazu Ekino, Tomoaki Takasaki, Hiroyuki Takagiwa, Jun Akimitsu, Hironobu Fujii

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


We have measured superconducting tunneling spectra of NbB2. This compound is isostructural to the high-Tc superconductor MgB 2. The most representative spectra at 4.2 K exhibit intensive gap-edge peaks at ±2.2-2.6 mV ( = ±2Δ/e) for the superconductor-insulator-superconductor (SIS) break junction. Upon warming, the gap feature disappears at Tc = 6.5-7 K. This leads to the gap ratio 2Δ(0)/kBTc = 4.3-4.5 with the extrapolated Δ(0) using the BCS prediction. The present result demonstrates that NbB2 is a strong-coupling superconductor with the gap ratio comparable to that for MgB2.

Original languageEnglish
Pages (from-to)828-829
Number of pages2
JournalPhysica C: Superconductivity and its applications
Issue number1-4
Publication statusPublished - Aug 2004
Externally publishedYes
EventProceedings of the International Conference on Materials - Rio de Janeiro, Brazil
Duration: May 25 2003May 30 2003


  • AlB-type structure
  • Break junction
  • Electron tunneling
  • NbB
  • Superconducting gap

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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