Distribution of superconducting energy gaps in GdBa2Cu3O7 obtained from point-contact spectroscopy
A. I. Akimenko, G. Goll, H. v. Löhneysen, V. A. Gudimenko
DOI 10.1103/PhysRevB.46.6409 · Physical Review B
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Abstract
Point-contact spectra of GdBa2Cu3O7 (with Ag as counterelectrode) exhibit reproducible wide minima in the differential resistance dV/dI vs voltage V, which are attributed to the superconducting energy gap. The energy positions and widths of these gap features correspond to the gap distribution extracted earlier from YBa2Cu3O7 point-contact spectra (with narrow gap minima). A comparison with the Blonder-Tinkham-Klapwijk model suggests that the distribution of wide gaps in GdBa2Cu3O7 results from orificelike point contacts. The form of the spectra does not change when cooling below the antiferromagnetic transition at TN=2.24 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| GdBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 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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