Retention of Two-Band Superconductivity in Highly Carbon-Doped MgB2

Details Retention of Two-Band Superconductivity in Highly Carbon-Doped MgB2 Retention of Two-Band Superconductivity in Highly Carbon-Doped MgB2

2003-03-19

arxiv.org/abs/cond-mat/0303403v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures; added one figure, added one reference, minor changes to the text, manuscript accepted for publication as a

Scientific paper

10.1103/PhysRevB.68.060508

Tunneling data on MgB_{1.8}C_{0.2} show a reduction in the energy gap of the pi-bands by a factor of two from undoped MgB2 that is consistent with the Tc reduction, but inconsistent with the expectations of the dirty limit. Dirty-limit theory for undoped MgB2 predicts a single gap about three times larger than measured and a reduced Tc comparable to that measured. Our heavily-doped samples exhibit a uniform dispersion of C suggestive of significantly enhanced scattering, and we conclude that the retention of two-band superconductivity in these samples is caused by a selective suppression of interband scattering.

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