Two-band/two-gap superconductivity in carbon-substitutedMgB2evidenced by point-contact spectroscopy

2003/03/31 by P. Samuely, Z. Hoľanová, Z. Holanova +8 · 4 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.mtrl-sci #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.68.020505

published as Phys. Rev. B 68, 020505 (R) (2003) · 3 eps figs

arxiv created 2003/03/31 · openalex publication_date 2003/07/29 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The Andreev reflection measurements of the superconducting energy gap in the carbon-substituted MgB₂ are presented. Despite the strong suppression of the transition temperature by 17 K in comparison with the pure MgB₂, the same reduced value of the small superconducting energy gap with 2\ensuremathΔ/kT_c\ensuremath≈1.7 has been systematically observed. This indicates that the two-band/two-gap superconductivity is still preserved here.

Citations

• Superconductivity inMgB2: Clean or Dirty?
• Vortex Imaging in theπBand of Magnesium Diboride
• Bardeen-Cooper-Schrieffer Theory of Superconductivity in the Case of Overlapping Bands
• Evidence for Two Superconducting Energy Gaps inMgB2by Point-Contact Spectroscopy

Cited by

• Difference between Al and C doping in anisotropic upper critical field development inMgB2
• MgB2single crystals substituted with Li and with Li-C: Structural and superconducting properties
• Systematic Effects of Carbon Doping on the Superconducting Properties ofMg(B1−xCx)2
• Toward one-band superconductivity inMgB2