Physics – Condensed Matter – Superconductivity
Scientific paper
2005-10-13
Phys. Rev. Lett. 97, 037001 (2006)
Physics
Condensed Matter
Superconductivity
4 pages, 5 eps figures. New theoretical results added, text and some figures changed. References added
Scientific paper
10.1103/PhysRevLett.97.037001
We present the first results of directional point-contact measurements in Mg_{1-x}Mn_{x}B_2 single crystals, with x up to 0.015 and bulk T_c down to 13.3 K. The order parameters Delta_{sigma} and Delta_{pi} were obtained by fitting the conductance curves with the two-band Blonder-Tinkham-Klapwijk (BTK) model. Both Delta_{pi} and Delta_{sigma} decrease with the critical temperature of the junctions T_c^A, but remain clearly distinct up to the highest Mn content. Once analyzed within the Eliashberg theory, the results indicate that spin-flip scattering is dominant in the sigma band, as also confirmed by first-principle band structure calculations.
Bernardini Fabio
Calzolari Arrigo
Daghero Dario
Gonnelli Renato S.
Karpinski Janusz
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