Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 52: Superconductivity: Fe-based Superconductors – FeSe and others
TT 52.1: Vortrag
Mittwoch, 18. März 2015, 09:30–09:45, H 2053
Electric transport and magnetic properties of high quality FeSe crystals grown by flux method — •Antonio Leo1,2, Anita Guarino1,2, Gaia Grimaldi2, Massimiliano Polichetti1,2, Davide Mancusi1, Armando Galluzzi1, Krastyo Buchkov3, Elena Nazarova3, Angela Nigro1,2, and Sandro Pace1,2 — 1Physics Department, University of Salerno, Salerno, Italy — 2CNR-SPIN Institute, Salerno Unit, Salerno, Italy — 3Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgaria
Among the families of iron-based superconductors, the 11-family is one of the most attractive for high field applications at low temperatures. The optimization of the fabrication processes for thin films and bulks is the first step for producing tapes and cables for practical high power conductors. An essential part of this processes is the characterization of electric transport and magnetic properties. In this work, we present the results of such characterization on high quality FeSe crystals grown following the NaCl/KCl flux technique developed by Mok et al. [B. Mok et al., Crystal Growth & Design vol. 9(7), May 2009, pp. 3260-3264], with few modifications related to the specifications of the fabrication equipment. By magneto-resistance measurements and Vibrating Sample Magnetometry, we investigate the field vs. temperature phase diagrams of the samples, which show critical temperature values which are among the highest values registered for this compound. The pinning activation energy is thus derived as a function of magnetic field in order to evaluate the potential applications of this high quality FeSe compound.