Glassy Transition in the Vortex Lattice of Ba(Fe0.93Rh0.07)2As2 superconductor, probed by NMR and ac-susceptibility

Abstract

By using Nuclear Magnetic Resonance and ac-susceptibility, the characteristic correlation times for the vortex dynamics, in an iron-based superconductor, have been derived. Upon cooling, the vortex dynamics displays a crossover consistent with a vortex glass transition. The correlation times, in the fast motions regime, merge onto a universal curve which is fit by the Vogel-Fulcher law, rather than by an Arrhenius law. Moreover, the pinning barrier shows a weak dependence on the magnetic field which can be heuristically justified within a fragile glass scenario. In addition, the glass freezing temperatures obtained by the two techniques merge onto the de Almeida-Thouless line. Finally the phase diagram for the mixed phase has been derived.

6 pages, 9 figures

References in corpus (4)

• NMR relaxation rate in superconducting pnictides: extended $s_{\pm }$ scenario
• NMR investigation of superconductivity and antiferromagnetism in CaFe${}_2$As${}_2$ under pressure
• AC susceptibility investigation of vortex dynamics in nearly-optimally doped REFeAsO${}_{1-x}$F${}_x$ superconductors (RE = La, Ce, Sm)
• NMR investigation of vortex dynamics in Ba(Fe0.93Rh0.07)2As2 superconductor

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• Iron-based superconductors: tales from the nuclei
• Vortex Lattice Melting of a NbSe2 single grain probed by Ultrasensitive Cantilever Magnetometry