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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity: Vortex Physics

TT 33.4: Vortrag

Dienstag, 1. April 2014, 10:30–10:45, HSZ 201

ac susceptibility investigation of vortex dynamics in nearly-optimally doped Ba(Fe_1−xCo_x)₂As₂ — •Giacomo Prando¹, Romain Giraud¹, Saicharan Aswartham¹, Oleksii Vakaliuk¹, Christian Hess¹, Sabine Wurmehl^1,2, Anja Wolter-Giraud¹, and Bernd Büchner^1,2 — ¹Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, Germany — ²Institut für Festkörperphysik, Technische Universität Dresden, Germany

In this contribution we will report about the dynamical features of the flux lines in single crystals of optimally-doped superconducting Ba(Fe_1−xCo_x)₂As₂ [1]. Investigations were performed by means of magneto-resistivity and first-harmonic ac susceptometry. The extremely high-quality of the sample allows us to enlighten the emergence of a thermodynamical phase transition between the different configuration of vortices in the H−T phase diagram. Insights will be provided into the anomalous features of the magnetic relaxation and into the nature of the glassy phase. As a surprising output, non-negligible values of chemical doping (x = 10 %) act as a remarkable low level of quenched disorder for the vortices.
G. Prando et al., Journ. Phys.: Cond. Matt. 25, 505701 (2013)