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23 April 2024 |
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Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies | | P. Szabo
; P. Samuely
; Z. Hol’anova
; S. Bud’ko
; P. C. Canfield
; J. Marcus
; | | Date: |
13 Apr 2006 | | Subject: | Superconductivity | | Abstract: | The two-band/two-gap superconductivity in aluminium and carbon doped MgB$_2$ has been addressed by the point-contact spectroscopy. Two gaps are preserved in all samples with $T_c’s$ down to 22 K. The evolution of two gaps as a function of the critical temperature in the doped systems suggest the dominance of the band-filling effects but for the increased Al-doping the enhanced interband scattering approaching two gaps must be considered. The magnetic field dependences of the Andreev reflection excess currents as well as zero-energy density of states determined from the experimental data are used to analyze the intraband scattering. It is shown, that while the C-doping increases the intraband scattering in the $pi$-band more rapidly then in the $sigma$ band, the Al-doping does not change their relative weight. | | Source: | arXiv, cond-mat/0604342 | | Services: | Forum | Review | PDF | Favorites | |
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