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

Abstract

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.

7 pages (Including figure captions) and 4 figures

References in corpus (5)

• Superconductivity of metallic boron in MgB_2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity in Dense $Mg{B}_2$ Wires
• Tunneling spectroscopy in small grains of superconducting MgB2
• Tunneling spectroscopy measurement of the superconductor gap parameter of MgB_2

Cited by in corpus (11)

• Multiband model for tunneling in MgB2 junctions
• Specific heat of MgB${}_2$ in a one- and a two-band model from first-principles calculations
• Probing multiband superconductivity by point-contact spectroscopy
• Multiband model for penetration depth in MgB2
• Josephson effect in MgB_2 break junctions
• Break-Junction Tunneling on MgB_2
• Superconducting energy gap distribution in c-axis oriented MgB${}_2$ thin film from point contact study
• Rigid vortices in MgB2
• Tunnel junctions on as-grown superconducting MgB2 thin films
• Temperature and junction-type dependency of Andreev reflection in MgB2
• rf surface impedance of a two-gap superconductor, considering magnesium diboride for accelerator applications