We investigate application-relevant superconductors, mainly in thin the form of films, regarding optimal preparation techniques, improvements of their electrical transport properties and possible applications. The work is structured in three research focusses which are interconnected and built on each other:
New Materials: The growth of thin films and layer systems of novel superconductors (as recently the Fe-based superconductors, FBS) is investigated fundamentally and optimized for the preparation of high-quality samples (microstructure and superconducting properties). Especially the pulsed laser deposition (PLD) and the chemical solution deposition (CSD) are used. Material parameters and structure-property relationships of new, especially application-relevant superconductors are investigated in detail.
Electrical Transport Properties: Promising new and established superconductors are tailored and optimized regarding specific applications, especially in electrical energy technology. At the same time, the knowledge on anisotropic pinning in layer systems of unconventional superconductors (cuprates, FBS) and their nanocomposites as well as in well-established low-temperature superconductors (e.g. Nb3Sn) is extended. The goal is to adjust the microstructure to be optimal for a specific application, to possibly achieve record values of critical current and pinning force densities or even to reach fundamental limits.
Coated conductor development: Here, the results of 1. and 2. are transferred to films on technical substrates with the goal to improve the coated conductor production of these materials. Novel materials and material combinations are first deposited on small samples (typically 1 × 1 cm), established, industry-relevant materials also in reel-to-reel deposition on up to 100 m long metallic tapes. Cooperations with industry partners (recently dnano, THEVA, Bruker) are desired.