Phonon spectroscopy of superconducting Nb using point-contact tunneling
Qiang Huang, J. F. Zasadzinski, K. E. Gray
DOI 10.1103/PhysRevB.42.7953 · Physical Review B
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Abstract
Tunneling spectroscopy measurements have been made on single crystals of Nb using the point-contact technique with a Au tip. The current-voltage characteristics, I(V) and dI/dV, reproduce the results obtained from conventional, thin-film planar junctions. In the range of 5- to 50-meV bias, the tunneling conductance displays the characteristic structures associated with the phonon density of states for Nb, including a low-energy mode near 10 meV, previously observed only in junctions on the (100) crystal face. These results demonstrate that the point-contact tunneling method can be used to measure the electron-phonon interaction in superconductors with the same degree of sensitivity as found in thin-film tunneling spectroscopy. The high-bias conductance was always an increasing function of voltage, as expected for tunnel-barrier transmission, and never displayed the anomalous decreasing behavior found in low-resistance junctions on high-temperature superconductors (HTS’s). We draw some inferences about the effects of heating and discuss them in relation to point-contact tunneling into the HTS materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi1.7Pb0.3Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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