Effective Vortex Pinning in MgB2 thin films

Abstract

We discuss pinning properties of MgB2 thin films grown by pulsed-laser deposition (PLD) and by electron-beam (EB) evaporation. Two mechanisms are identified that contribute most effectively to the pinning of vortices in randomly oriented films. The EB process produces low defected crystallites with small grain size providing enhanced pinning at grain boundaries without degradation of Tc. The PLD process produces films with structural disorder on a scale less that the coherence length that further improves pinning, but also depresses Tc.

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• Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
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Cited by in corpus (5)

• Transport critical current density in Fe-sheathed nano-SiC doped MgB2 wires
• Critical Fields and Critical Currents in MgB2
• Comparative study of in situ and ex situ MgB2 films deposited by pulsed laser deposition
• Off-axis MgB2 films using an in situ annealing pulsed laser deposition method
• Superconducting gap structure and pinning in disordered MgB2 films