Temperature and junction-type dependency of Andreev reflection in MgB2

Details Temperature and junction-type dependency of Andreev reflection in MgB2 Temperature and junction-type dependency of Andreev reflection in MgB2

2001-07-11

arxiv.org/abs/cond-mat/0107239v1

J. Phys. Chem. Solids 63, 2319 (2002)

Physics

Condensed Matter

Superconductivity

5 pages, 4 eps figures, SNS 2001 conference

Scientific paper

10.1016/S0022-3697(02)00229-9

We 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.

Affiliated with

Also associated with

No associations

Rating

Temperature and junction-type dependency of Andreev reflection in MgB2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Temperature and junction-type dependency of Andreev reflection in MgB2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature and junction-type dependency of Andreev reflection in MgB2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-537917