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27 April 2024

» arxiv » cond-mat/0308152

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The Magnetic-field Dependence of the Gaps in a Two-band Superconductor: A Point-contact Study of MgB_2 Single Crystals
R.S. Gonnelli ; D. Daghero ; A. Calzolari ; G.A. Ummarino ; Valeria Dellarocca ; V.A. Stepanov ; J. Jun ; S.M. Kazakov ; J. Karpinski ;
Date:	7 Aug 2003
Journal:	Phys. Rev. B 69, 100504(R) (2004)
Subject:	Superconductivity \| cond-mat.supr-con
Abstract:	We present the results of directional point-contact measurements in MgB_2 single crystals, in magnetic fields up to 9 T parallel to the c axis. By fitting the conductance curves of our point contacts -- showing clear Andreev-reflection features -- with a generalized Blonder-Tinkham-Klapwijk model, we were able to extract the values of the two gaps Delta_sigma and Delta_pi. The comparison of the resulting Delta_sigma(B) and Delta_pi(B) curves to the theoretical predictions of the two-band model in dirty limit, recently appeared in literature, allows the first direct test of this model and gives a clear and quantitative proof that the pi band, even in the best single crystals, is in the moderate dirty limit.
Source:	arXiv, cond-mat/0308152
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