Intraband versus interband scattering rate effects in neutron irradiated MgB2

Details Intraband versus interband scattering rate effects in neutron irradiated MgB2 Intraband versus interband scattering rate effects in neutron irradiated MgB2

2006-11-28

arxiv.org/abs/cond-mat/0611700v1

Europhysics Letters 77 (2007) 57005

Physics

Condensed Matter

Superconductivity

3 figures

Scientific paper

10.1209/0295-5075/77/57005

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.

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