Symmetry and Temperature dependence of the Order parameter in MgB2 from point contact measurements

Details Symmetry and Temperature dependence of the Order parameter in MgB2 from point contact measurements Symmetry and Temperature dependence of the Order parameter in MgB2 from point contact measurements

2001-03-25

arxiv.org/abs/cond-mat/0103512v1

Physics

Condensed Matter

Superconductivity

7 pages (Including figure captions) and 4 figures

Scientific paper

10.1103/PhysRevB.64.060506

We have performed differential conductance versus voltage measurements of Au/MgB2 point contacts. We find that the dominant component in the conductance is due to Andreev reflection. The results are fitted to the theoretical model of BTK for an s-wave symmetry from which we extract the value of the order parameter (Delta) and its temperature dependence. From our results we also obtain a lower experimental bound on the Fermi velocity in MgB2.

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