Role of interband scattering in neutron irradiated MgB₂ thin films by Scanning Tunneling Spectroscopy measurements
classification
❄️ cond-mat.supr-con
keywords
filmsneutronscanningspectroscopythintunnelingallowedband
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A series of MgB$_2$ 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 $\pi$ 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 frame of two-band superconductivity.
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