Unexpected impact of magnetic disorder on multiband superconductivity

M. M. Korshunov; D. V. Efremov; A. A. Golubov; O. V. Dolgov

doi:10.1103/PhysRevB.90.134517

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Unexpected impact of magnetic disorder on multiband superconductivity

M. M. Korshunov, D. V. Efremov, A. A. Golubov, O. V. Dolgov

DOI 10.1103/PhysRevB.90.134517 · Physical Review B

T1

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Abstract

We analyze how the magnetic disorder affects the properties of the two-band s± and s++ models, which are the subject of discussions regarding iron-based superconductors and other multiband systems like MgB2. We show that there are several cases when the transition temperature Tc is not fully suppressed by magnetic impurities in contrast to the Abrikosov-Gor'kov theory, but a saturation of Tc takes place in the regime of strong disorder. These cases are: (1) the purely interband impurity scattering and (2) the unitary scattering limit. We show that in the former case the s± gap is preserved, while the s++ state transforms into the s± state with increasing magnetic disorder. For case (2), the gap structure remains intact.

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.	—	Pressure not reported	unknown