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25 April 2024

» arxiv » cond-mat/0510329

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The effect of magnetic impurities in a two-band superconductor: A point-contact study of Mn-substituted MgB2 single crystals
R.S. Gonnelli ; D. Daghero ; G.A. Ummarino ; A. Calzolari ; M. Tortello ; V.A. Stepanov ; N.D. Zhigadlo ; K. Rogacki ; J. Karpinski ;
Date:	13 Oct 2005
Abstract:	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. The results can be explained within the Eliashberg theory as being mainly due to the spin-flip scattering within the sigma and pi band, with a dominant effect on the sigma channel.
Source:	arXiv, cond-mat/0510329
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