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Title: Retention of two-band superconductivity in highly carbon-doped MgB 2
Authors: Schmidt, H
Gray, KE
Hinks, DG
Zasadzinski, JF
Avdeev, M
Jorgensen, JD
Burley, JC
Keywords: Tunnel effect
Crystal doping
Band theory
Issue Date: 29-Aug-2003
Publisher: American Physical Society
Citation: Schmidt, H., Gray, K. E., Hinks, D. G., Zasadzinski, J. F., Avdeev, M., Jorgensen, J. D., & Burley, J. C. (2003). Retention of two-band superconductivity in highly carbon-doped MgB 2. Physical Review B, 68(6), 060508. doi:10.1103/PhysRevB.68.060508
Abstract: Tunneling data on MgB1.8C0.2 show a reduction in the energy gap of the π bands by nearly a factor of 2 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. ©2003 American Physical Society
ISSN: 2469-9969
Appears in Collections:Journal Articles

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