Andreev reflection spectroscopy of MgB2 in the vortex state

✍ Scribed by P. Samuely; P. Szabó; J. Kačmarčı́k; T. Klein

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 284 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2004.01.018

✦ Synopsis

Spectroscopy based on the Andreev reflection (AR) process at the interface between the normal metal tip and the superconductor has become one of the very successful methods for studies in novel exotic superconductors. The method is capable to address the size, symmetry as well as multiplicity of the superconducting order parameter. The method provided one of the first evidences of the two-gap superconductivity in MgB 2 with a detailed temperature dependence of the both gaps. A theory treating the Andreev reflection spectroscopy in the mixed state is missing. We analyse the AR spectra of MgB 2 in the mixed state via modelling the magnetic pair-breaking by the increasing spectral broadening parameter C. As a result a non-trivial pair breaking effect in the p-band is found.