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 language | English |
|---|---|
| Article number | 094705 |
| Journal | journal of the physical society of japan |
| Volume | 76 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 1 2007 |
| Externally published | Yes |
Keywords
- Energy gap
- NbB
- Specific heat
- Superconductivity
- Tunneling spectroscopy
ASJC Scopus subject areas
- Physics and Astronomy(all)
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Kuroiwa, S., Tomita, Y., Sugimoto, A., Ekino, T., & Akimitsu, J. (2007). Specific heat and tunneling spectroscopy study of NbB2 with maximum Tc ∼ 10K. journal of the physical society of japan, 76(9), [094705]. https://doi.org/10.1143/JPSJ.76.094705