Articles you may be interested inMeasurement of magnetic penetration depth and superconducting energy gap in very thin epitaxial NbN films Appl. Phys. Lett. 96, 072509 (2010); 10.1063/1.3314308Superconducting properties and normalstate resistivity of singlecrystal NbN films prepared by a reactive rf magnetron sputtering method

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Narrowband rejection filters can be constructed from multilayers of dielectric and ultrathin metal films operating in the anomalous skin effect region constrained by the optical size effect. The wavelength of the main reflecting spectrum is wholly determined by the dielectric thickness, and the bandwidth can be reduced by increasing the total number of layers and selecting the dielectric film with high refractive index while diminishing the thickness of the metal film.

We have demonstrated that the normal-state resistivity of sufficiently thick Y1Ba2Cu307-6 thin films can be fitted very well by the Bloch-Gruneisen equation. As the film thickness decreases, the localization effect becomes predominant presuming the manifestation of surface defects and vacancies over the bulk region. The evaluated Debye temperatures span over a range which is consistent with experimental values. Below some critical thicknesses, the transport behavior in thin Y,Ba,Cu,07-s films deviates from the Boltzmann conductivity and the temperature coefficient of the electric resistivity becomes negative, which can be explained by adopting quantum corrections for localization and interaction effects. The origin of nonmetallic behavior can be understood quantitatively in terms of the competition between the quantum corrections and the conventional Boltzmann conductivity. In these ultrathin superconducting films, the elastic mean-free path arising from defect and heavy impurity scattering is very short and much smaller than the inelastic mean-free path, even at room temperature.

The Breit-Wigner formula is exploited to calculate the tunneling transmission probability affected by longitudinal optical phonon scattering in mUltiple quantum wells composed of Gal_xA.lxAs compounds. A quantitative result shows that the resonance electron energy and the integrated total transmission probability through the potential barriers are not changed, while the transmission peak is reduced and the linewidth is broadened.