Differential conductance of point contacts between an iron-based superconductor and a normal metal
D. Kuzmanovski, M. G. Vavilov
DOI 10.1103/PhysRevB.84.060514 · Physical Review B
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Abstract
We present a theoretical description of the differential conductance of point contacts between a normal metal and a multiband superconductor with extended s± pairing symmetry. We demonstrate that the interband impurity scattering broadens the coherent peak near the superconducting gap and significantly reduces its height even at relatively low scattering rates. This broadening is consistent with a number of recent experiments performed for both tunnel junctions and larger diffusive contacts. Our theory helps to better evaluate the energy gap of iron-based superconductors from point-contact Andreev spectroscopy measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Ba0.6K0.4)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | unknown |
| BaFe2As2 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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