Intraband versus interband scattering rate effects in neutron irradiated MgB2

Abstract

One of the most important predictions of the two-gap theory of superconductivity concerns the role of interband scattering (IBS) by impurities. IBS is expected to decrease the critical temperature, Tc, of MgB2 to a saturation value of about 20 K, where the two gaps merge to a single one. These predictions have been partially contradicted by experiments. In fact, Tc does not saturate in irradiated samples, but decreases linearly with residual resistivity and the merging of the gaps has been observed at a much lower Tc (11 K). In this paper we argue that, while at low level of disorder IBS is the leading mechanism that suppresses superconductivity, at higher disorder the experimental results can only be understood if the smearing of the density of states due to intraband electron lifetime effects is considered.

arXiv comment3 figures

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• Disorder effects on the superconducting properties of BaFe${}_{1.8}$Co${}_{0.2}$As${}_2$ single crystals
• Neutron Irradiation of Sm-1111
• Strong-coupling superconductivity and weak vortex pinning in Ta-doped CsV${}_3$Sb${}_5$ single crystals
• Application prospects of MgB${}_2$ in view of its basic properties
• Experimental confirmation of the low B isotope coefficient in MgB2
• The influence of weak texture on the critical currents in polycrystalline MgB${}_2$
• Two-bands superconductivity with intra- and interband pairing for synthetic superlattices
• Effect of Impurities with Internal Structure on Multiband Superconductors - Possible Enhancement of Transition Temperature -
• Consequences of the peculiar intrinsic properties of MgB2 on its macroscopic current flow