2004/04/05 by Z. Hoľanová, Z. Holanova, P. Szabo +7 · 1 citation
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.70.064520
published as PHYSICAL REVIEW B 70, 064520 (2004) · 5 eps figures
arxiv created 2004/04/05 · openalex publication_date 2004/08/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Point-contact measurements on the carbon-substituted Mg(B_1\ensuremath-xCx)2 filament/powder samples directly reveal a retention of the two superconducting energy gaps in the whole doping range from x=0 to x\ensuremath≈0.1. The large gap on the \ensuremathσ-band is decreased in an essentially linear fashion with increasing the carbon concentrations. The changes in the small gap \ensuremathΔ_\ensuremathπ up to 3.8% C are proportionally smaller and are more difficult to detect but for the heavily doped sample with x\ensuremath≈0.1 and Tc=22\phantom\rule0.3em0exK both gaps are still present, and significantly reduced, consistent with a strong essentially linear, reduction of each gap with the transition temperature.