Role of interband scattering in neutron irradiated MgB2 thin films by Scanning Tunneling Spectroscopy measurements
R. Di Capua, H. U. Aebersold, C. Ferdeghini, V. Ferrando, P. Orgiani, M. Putti, M. Salluzzo, R. Vaglio, X. X. Xi
Abstract
A series of MgB2 thin films systematically disordered by neutron irradiation have been studied by Scanning Tunneling Spectroscopy. The c-axis orientation of the films allowed a reliable determination of local density of state of the π band. With increasing disorder, the conductance peak moves towards higher voltages and becomes lower and broader, indicating a monotonic increase of the π gap and of the broadening parameter. These results are discussed in the frame of two-band superconductivity.
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