Artificial pinning centers on the MgB2 surface: the influence on the vortex flow in magnetic field

Abstract

Superconducting properties of high-quality films of the first multiband superconductor, magnesium diboride, have been investigated. The dominating role of thermally activated flux flow for the low parts of the superconducting transition are responsible for the resistivity of MgB2 near the superconducting transition. A novel method to self organize nano particles with different hierarchical distance parameters on surfaces, was used to adsorb nano particles on MgB2 films. The influence of a homogenous network of Co nano particles, which were deposited on the surface of the MgB2 layers, on the resistive transition broadening in a magnetic field has been investigated.