You are here

    • You are here:
    • Home > STP451 - Low Temperature – High Field Performance of Iron Chalcogenides Thin Films

STP451 - Low Temperature – High Field Performance of Iron Chalcogenides Thin Films

Low Temperature – High Field Performance of Iron Chalcogenides Thin Films
 
Carlo Ferdeghini, E. Bellingeri, R. Buzio, V. Braccini, S. Kawale, A. Gerbi, M. Adamo, C. Nappi, and E. Sarnelli
 
CNR-SPIN, Corso Perrone 24, 16152 Genova, Italy
 
 
Abstract — Among the various families of Fe-based superconductors, iron chalcogenides, while presenting a transition temperature not particularly high, show great advantages for potential applications in high fields, albeit at liquid helium temperature. In thin films, the strain can push the critical temperature up to 21K, the critical field up to more than 50 T and the irreversibility field close to this value. The critical current and its anisotropy heavily depend on the type of substrate used for the deposition. It is possible to reach values up to 1 MA/cm2 at liquid helium temperatures and self-field, with a weak magnetic field dependence and without appreciable anisotropy. In this study, we will show what defects will act as pinning centers for different kind of substrates and how the shape of the pinning centers determines the observed anisotropic currents. Finally, in the case of STO, we present the first measurements of FeSeTe thin films deposited on bi-crystals showing that, differently from HTS, the high angle grain boundary is less limiting the supercurrent. Experiments indicate that the current is not appreciably depressed up to a misorientation angle of 10 degrees.

Keywords (Index Terms) — Fe-chalcogenides, high field performances, critical currents, grain boundaries.

IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), July 2015.
Received July 16, 2015; Accepted August 10, 2015. Reference STP451; Category 2, 5. 
Invited presentation M3OrA-01 given at CEC-ICMC 2015; Tucson, USA, June 28 - July 02, 2015.