Point-Contact Spectroscopy in Doped and Irradiated MgB2 |
| Journal |
Advances in Science and Technology (Volume 47) |
| Volume |
Science and Engineering of Novel Superconductors V |
| Edited by |
P. VINCENZINI and A. RIGAMONTI |
| Pages |
75-81 |
| DOI |
10.4028/www.scientific.net/AST.47.75 |
| Online since |
October, 2006 |
| Authors |
Dario Daghero,
R.S. Gonelli,
A. Calzolari,
G.A. Ummarino,
M. Tortello,
V.A. Stepanov,
N.D. Zhigadlo,
K. Rogacki,
J. Karpinski,
M. Putti
|
| Keywords |
Magnesium Diboride, Point-Contact Spectroscopy, Two-Band Superconductivity |
| Abstract |
We review recent results of point-contact spectroscopy (PCS) in doped (with Al, C or
Mn) and neutron-irradiated samples of the two-band superconductor MgB2. The aim of these
measurements was to clarify the role of inter- and intra-band scattering, and to test the theoretical
expectations about the effects of substitutions and disorder on two-band superconductivity. The gap
amplitudes, Δπ and Δσ, were obtained as a function of the critical temperature of the junctions (or of
the doping content) by fitting the conductance curves with the two-band BTK model. The analysis
of the resulting curves within the Eliashberg theory allowed us to extract information on the partial
DOSs, as well as on the scattering rates within and between the two bands. The results are discussed
and compared to theoretical expectations. |
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