A series of Mg B2 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 the local density of states 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 framework of two-band superconductivity.
Role of interband scattering in neutron irradiated Mg B2 thin films by scanning tunneling spectroscopy measurements
PUTTI, MARINA;
2007-01-01
Abstract
A series of Mg B2 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 the local density of states 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 framework of two-band superconductivity.
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