Tunneling spectroscopy of the superconducting energy gap in RNi2B2C(R=YandLu)
Toshikazu Ekino, Hironobu Fujii, Makoto Kosugi, Yuji Zenitani, Jun Akimitsu
DOI 10.1103/PhysRevB.53.5640 · Physical Review B
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Abstract
Superconducting energy gap in RNi2B2C (R=YandLu) has been investigated using a break-junction tunneling technique. The observed differential conductance dIdV is well described by the BCS density of states with a small lifetime broadening parameter. We have found small gap values for the local low-Tc phases in addition to the bulk Tc of 15.6-16.6 K. The gap value of 2Δ=4.5 meV with Tc=15 K gives the BCS ratio of 2ΔkBTc=3.5, which is kept constant down to the observed lowest Tc of 4.6 K. These results give clear evidence for the BCS mechanism of superconductivity for these compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.6 | Pressure not reported | onset |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.6 | Pressure not reported | onset |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.2 | Pressure not reported | unknown |
| YPd2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
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