Point-Contact Spectroscopy in Doped and Irradiated MgB2

Daghero, Dario; Gonelli, R.S.; Calzolari, A.; Ummarino, G.A.; Tortello, M.; Stepanov, V.A.; Zhigadlo, N.D.; Rogacki, K.; Karpinski, J.; Putti, M.

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Change of Superconducting Parameters of Y-Ba-Cu-O Slabs and Rings due to High-Energy Ion Beams, p.63
Interband Pairing Interaction in Magnesium Diboride Probed by Tunneling Spectroscopy, p.69
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Mechanical Properties and Fractographical Analysis by Laser Scanning Confocal Microscopy (LSCM) of Laser Textured Bi(Pb)-2212 Superconducting Materials, p.82
Application of Laser Technique on the Formation of Superconductive Layer on the Bulk of Press Formed Bi System - Evaluation of Mechanical Properties of the Treated Bulk, p.88
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Paper Title:

Point-Contact Spectroscopy in Doped and Irradiated MgB₂

Periodical	Advances in Science and Technology (Volume 47)
Main Theme	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
Citation	Dario Daghero et al., 2006, Advances in Science and Technology, 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
Price	US$ 28,-

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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.