Second superconducting energy gap of Nb3Sn observed by breakjunction point-contact spectroscopy
M. Marz, G. Goll, W. Goldacker, R. Lortz
DOI 10.1103/PhysRevB.82.024507 · Physical Review B
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Abstract
We report on investigations of the superconducting energy gap of the A15 superconductor Nb3Sn by point-contact spectroscopy of breakjunctions. The voltage-dependent differential conductance dI/dV reveals features of a second energy gap besides the energy gap known from previous tunnel measurements with maxima at Δ1=3.92±0.16 meV and Δ2=0.85±0.17 meV as derived from a histogram summarizing the data of more than 60 contacts. These findings provide spectroscopic evidence that Nb3Sn belongs to the class of two-band superconductors and they are in line with low-temperature specific-heat measurements on Nb3Sn.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18.1 | Pressure not reported | onset |
| Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18.1 | Pressure not reported | midpoint |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb6Sn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.07 | Pressure not reported | unknown |
| NbSn2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.68 | Pressure not reported | unknown |
| Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.72 | Pressure not reported | unknown |
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