Critical Currents in Fe based Superconductors

01.10.2010 - 31.03.2015
Research funding project
The current transport in the recently discovered Fe based superconductors will be investigated system-atically. The fundamental pinning properties will be assessed on single crystals and thin films. While uncorrelated defects are expected to dominate flux pinning in single crystals, growth related, corre-lated pinning centers usually prevail in thin films. Special emphasis will be placed on the anisotropy of the critical currents, which results from correlated disorder or from the effective mass anisotropy of the charge carriers. The influence of additional (uncorrelated) defects will be investigated by means of neutron irradiation experiments. Neutron irradiation allows the variation of the defect density in the sample samples and provides important benchmarking for material optimization. Large loss free currents have to pass grain boundaries in most applications. These intergranular cur-rents will be investigated by micro Hall probe scanning on naturally grown grain boundaries in sin-tered materials. The macroscopic current flow will be modeled by a percolation model in order to estimate the applica-tion potential of these new materials and to draw up guidelines for their optimization.

People

Project leader

Project personnel

Institute

Grant funds

  • FWF - Österr. Wissenschaftsfonds (National) Austrian Science Fund (FWF)

Research focus

  • Structure-Property Relationsship: 80%
  • Materials Characterization: 20%

Keywords

GermanEnglish
Magnetische Granularitätmagnetic granularity
Kritische Strömecritical currents

Publications