Localized states within the gap in a two-band superconductor

C. P. Moca; C. Horea

doi:10.1103/PhysRevB.66.052501

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Localized states within the gap in a two-band superconductor

C. P. Moca, C. Horea

DOI 10.1103/PhysRevB.66.052501 · Physical Review B

T1

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Abstract

We present results for strong-coupling calculations for the density of states in the presence of magnetic impurities in a two-band superconductor. Our calculations were done for the particular case of a MgB2 compound where two bands (σ and π B-like) intersect the Fermi level. If only the π band is responsible for superconductivity, then an impurity band will form in the energy gap of the π band. If the σ band is involved, then new features may be found in the density of states at frequencies between the superconducting gaps corresponding to π and σ bands. The validity of our results can be directly verified by measuring the density of states in the presence of magnetic impurities using tunneling experiments in MgB2. We also present analytical results for the doping dependence of the critical temperature.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	onset