Development of very high Jc in Ba(Fe1-xCox)2As2 thin films grown on CaF2

Abstract

Ba(Fe1-xCox)2As2 is the most tunable of the Fe-based superconductors (FBS) in terms of acceptance of high densities of self-assembled and artificially introduced pinning centres which are effective in significantly increasing the critical current density, Jc. Moreover, FBS are very sensitive to strain, which induces an important enhancement in critical temperature, Tc, of the material. In this paper we demonstrate that strain induced by the substrate can further improve Jc of both single and multilayer films by more than that expected simply due to the increase in Tc. The multilayer deposition of Ba(Fe1-xCox)2As2 on CaF2 increases the pinning force density Fp by more than 60% compared to a single layer film, reaching a maximum of 84 GN/m^3 at 22.5T and 4.2 K, the highest value ever reported in any 122 phase.

arXiv comment25 pages, 9 figures

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• Unusually high critical current of clean P-doped BaFe2As2 single crystalline thin film
• p-Wave Superconductivity in Iron-based Superconductors
• Superconducting properties of Ba(Fe1-xNix)2As2 thin films in high magnetic fields
• K-doped Ba122 epitaxial thin film on MgO substrate by buffer engineering
• Transport properties of ultrathin BaFe1.84Co0.16As2 superconducting nanowires
• Status of Iron Based Superconductors: characteristics and relevant properties for applications