Retention of two-band superconductivity in highly carbon-doped MgB2 -: art. no. 060508

被引：56

作者：

Schmidt, H

Gray, KE

Hinks, DG

Zasadzinski, JF

Avdeev, M

Jorgensen, JD

Burley, JC

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] IIT, Div Phys, Chicago, IL 60616 USA

来源：

PHYSICAL REVIEW B | 2003年 / 68卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.68.060508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tunneling data on MgB1.8C0.2 show a reduction in the energy gap of the pi bands by nearly a factor of 2 from undoped MgB2 that is consistent with the T-c 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 T-c 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.

引用

页数：4

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