Specific heat and tunneling spectroscopy study of NbB2 with maximum Tc ∼ 10K

Sogo Kuroiwa, Yoko Tomita, Akira Sugimoto, Toshikazu Ekino, Jun Akimitsu

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6 Citations (Scopus)


We report on magnetic, transport, specific heat and tunneling measurements of NbB2 with the maximum superconducting critical temperature Tc ∼ 10 K. The essential superconducting properties have been investigated through mapping out the critical field phase diagram, from which it is turned out to be type II superconductor with a small Ginzbrug-Landau parameter κ ∼ 2:2. Both the tunneling and specific heat measurements indicate that our NbB2 specimen has a single gap and s-wave pairing symmetry with a weak-coupling limit. The electron-phonon coupling constant is estimated to be λep = 0:71 ± 0:02, suggesting that the maximum T c of NbB2 can be explained by the McMillan formula.

Original languageEnglish
Article number094705
Journaljournal of the physical society of japan
Issue number9
Publication statusPublished - Sept 2007
Externally publishedYes


  • Energy gap
  • NbB
  • Specific heat
  • Superconductivity
  • Tunneling spectroscopy

ASJC Scopus subject areas

  • General Physics and Astronomy


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