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

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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
Volume76
Issue number9
DOIs
Publication statusPublished - Sep 2007
Externally publishedYes

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heat measurement
specific heat
spectroscopy
critical temperature
phase diagrams
heat
symmetry
electrons

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Specific heat and tunneling spectroscopy study of NbB2 with maximum Tc ∼ 10K. / Kuroiwa, Sogo; Tomita, Yoko; Sugimoto, Akira; Ekino, Toshikazu; Akimitsu, Jun.

In: Journal of the Physical Society of Japan, Vol. 76, No. 9, 094705, 09.2007.

Research output: Contribution to journalArticle

Kuroiwa, Sogo ; Tomita, Yoko ; Sugimoto, Akira ; Ekino, Toshikazu ; Akimitsu, Jun. / Specific heat and tunneling spectroscopy study of NbB2 with maximum Tc ∼ 10K. In: Journal of the Physical Society of Japan. 2007 ; Vol. 76, No. 9.
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