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 the local density of states of the pi band. With increasing disorder, the conductance peak moves towards higher voltages and becomes lower and broader, indicating a monotonic increase of the pi gap and of the broadening parameter. These results are discussed in the framework of two-band superconductivity.
Role of interband scattering in neutron irradiated MgB2 thin films by scanning tunneling spectroscopy measurements / DI CAPUA, Roberto; Aebersold, H. U.; Ferdeghini, C.; Ferrando, V.; Orgiani, P.; Putti, M.; Salluzzo, M.; Vaglio, Ruggero; Xi, X. X.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 75:1(2007), pp. 014515-1-014515-5. [10.1103/PhysRevB.75.014515]
Role of interband scattering in neutron irradiated MgB2 thin films by scanning tunneling spectroscopy measurements
DI CAPUA, ROBERTO;VAGLIO, RUGGERO;
2007
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 the local density of states of the pi band. With increasing disorder, the conductance peak moves towards higher voltages and becomes lower and broader, indicating a monotonic increase of the pi gap and of the broadening parameter. These results are discussed in the framework of two-band superconductivity.| File | Dimensione | Formato | |
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