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Article
Superfluid Density and Vortex Dynamics in S/F/S Heterostructures
We present electrical transport measurements in the microwave range in Superconductor/Ferromagnet/ Superconductor Nb/Pd 0.84Ni 0.16/Nb heterostructures, with different thickness of the ferromagnetic layer. We emp...
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Article
Directional Vortex Pinning at Microwave Frequency in YBa2Cu3O7−x Thin Films with BaZrO3 Nanorods
We investigate the effect of the anisotropy and of the directional pinning in YBa2Cu3O7−x films grown by pulsed laser ablation from targets containing BaZrO3 at 5 mol%. BaZrO3 inclusions ...
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Article
Superconducting and Structural Properties of Nb/PdNi/Nb Trilayers
The superconducting and structural properties of S/F/S (Superconductor/Ferromagnet/Superconductor) heterostructures have been studied by means of microwave measurements (1–20 GHz) and x-ray absorption fine str...
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Article
Microwave Properties of Nb/PdNi/Nb Trilayers
We combine wideband (1–20 GHz) Corbino Disk and Dielectric Resonator (8.2 GHz) techniques to study the microwave properties in Nb/PdNi/Nb trilayers, grown by UHV dc magnetron sputtering, composed by Nb layers ...
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Article
Vortex Motion and Quasiparticle Resistivity in MgB2 at Microwave Frequencies
The electrical transport in superconductors at nonzero frequencies is affected by the normal and superfiuid fractions, as well as moving vortices, resulting in intricate expressions for the complex resistivity...
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Article
Vortex State Microwave Resistivity in Tl-2212 Thin Films
We present measurements of the field induced changes in the 47 GHz complex resistivity, Δρ~(H, T), in Tl2Ba2CaCu2O8+x (TBCCO) thin films with T c ...
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Article
Dielectric Resonators for the Measurement of Superconductor Thin Films Surface Impedance in Magnetic Fields at High Microwave Frequencies
We present the design and realization of cylindrical dielectric resonators operating in the 40–60 GHz frequency range, designed for the measurement of the surface resistance and of the surface reactance shift ...
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Article
Mixed-State Microwave Response in Superconducting Cuprates
We report measurements of the magnetic field induced microwave complex resistivity in REBa2Cu3O7−δ thin films, with RE = Y, Sm. Measurements are performed at 48 GHz by means of a resonant cavity in the end-wall-r...
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Article
Substrate Contribution to the Surface Impedance of HTS Films on Si
We study the effects of semiconductor substrates on the surface impedance of high-T c Superconductor (HTS) YBa2Cu3O7−δ (YBCO) films. The characteristic impedanc...