Measurements of the electrical resistivity as a function of temperature, ρ(T), for different values of applied magnetic field, B<Subscript>a</Subscript> (0 ≤ B<Subscript>a</Subscript> ≤ 50 mT), were performed in polycrystalline samples of Bi<Subscript>1.65</Subscript>Pb<Subscript>0.35</Subscript>Sr<Subscript>2</ Subscript>Ca<Subscript>2</Subscript> Cu<Subscript>3</Subscript>O<Subscript>10+δ</Subscript> subjected to different uniaxial compacting pressure (UCP). We...</subscript></subscript></subscript><//></subscript></subscript></subscript></subscript></subscript>

We review the use of superconductors as a playground for the experimental study of front roughening and avalanches. Using the magneto-optical technique, the spatial distribution of the vortex density in the sample is monitored as a function of time. The roughness and growth exponents...

We present ac susceptibility measurements performed on (K, Ba)BiO<Subscript>3</Subscript>single crystals with different geometries: thick films, bars and hollow cylinders. We show that the h <Subscript>ac</Subscript> dependence of the real (χ′) and imaginary (χ′) parts of the ac susceptibility is in very good agreement with Brandt’s...</subscript></subscript>

We discuss the microwave energy losses in superconductors in the critical state. The field-induced variations of the surface resistance are determined, in the framework of the Coffey and Clem model, by taking into account the distribution of the vortex magnetic field inside the sample. It is...

In order to characterize flux flow through disordered type-II superconductors, we investigate the effects of columnar and point defects on the vortex velocity/voltage power spectrum in the driven non-equilibrium steady state. We employ three-dimensional Metropolis Monte Carlo simulations to...

We discuss the hysteretic behavior of the field-induced variations of the microwave surface resistance in superconductors in the critical state. Measurements have been performed in a bulk sample of Nb and a powdered one at different values of the temperature. We discuss a model, based on the...