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22 October 2021
  » arxiv » cond-mat/0607515

 Article overview

Andreev-reflection spectroscopy in neutron-irradiated Mg^{11}B_2
D. Daghero ; A. Calzolari ; G.A. Ummarino ; M. Tortello ; R.S. Gonnelli ; V.A. Stepanov ; C. Tarantini ; P. Manfrinetti ; E. Lehmann ;
Date 20 Jul 2006
Subject Superconductivity
AbstractWe report on recent results of point-contact spectroscopy measurements in Mg^{11}B_2 polycrystals irradiated at different neutron fluences up to 1.4 x 10^{20} cm^{-2}. The point contacts were made by putting a small drop of Ag paint -- acting as the counterelectrode -- on the cleaved surface of the samples. The gap amplitudes were extracted from the experimental conductance curves through a two-band Blonder-Tinkham-Klapwijk fit and reported as a function of the critical temperature of the junctions, TcA. The resulting Delta_sigma(TcA) and Delta_pi(TcA) curves show a clear merging of the gaps when TcA ~ 9K that perfectly confirms the findings of specific-heat measurements in the same samples. Anomalous contacts with TcA > Tc (being Tc the bulk critical temperature) were often obtained, particularly in samples irradiated at very high fluences. Their fit gave a different dependence of Delta_pi on TcA. The possible reasons of this unusual behavior are discussed in terms of short-range inhomogeneities and/or local current-induced annealing.
Source arXiv, cond-mat/0607515
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