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29 March 2024
 
  » arxiv » cond-mat/0107239

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Temperature and junction-type dependency of Andreev reflection in MgB2
R.S. Gonnelli ; A. Calzolari ; D. Daghero ; G.A. Ummarino ; V.A. Stepanov ; P. Fino ; G. Giunchi ; S. Ceresara ; G. Ripamonti ;
Date 11 Jul 2001
Journal J. Phys. Chem. Solids 63, 2319 (2002)
Subject Superconductivity | cond-mat.supr-con
AbstractWe studied the voltage and temperature dependency of the dynamic conductance of normal metal-MgB2 junctions obtained either with the point-contact technique (with Au and Pt tips) or by making Ag-paint spots on the surface of high-quality single-crystal-like MgB2 samples. The fit of the conductance curves with the generalized BTK model gives evidence of pure s-wave gap symmetry. The temperature dependency of the gap, measured in Ag-paint junctions (dirty limit), follows the standard BCS curve with 2Delta/kTc = 3.3. In out-of-plane, high-pressure point contacts we obtained almost ideal Andreev reflection characteristics showing a single small s-wave gap Delta = 2.6 +/- 0.2 (clean limit). These results support the two-gap model of superconductivity, the presence of a modified layer at the surface of the crystals and an important and non-conventional role of the impurities in MgB2.
Source arXiv, cond-mat/0107239
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