Glassy transition in the vortex lattice of Ba(Fe^sub 0.93^Rh^sub 0.07^)^sub 2^As^sub 2^ superconductor probed by NMR and ac-susceptibility

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...

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Bibliographic Details
Published in:Europhysics letters 2013-04, Vol.102 (1), p.P1
Main Authors: Bossoni, L, Carretta, P, Horvatic, M, Corti, M, Thaler, A, Canfield, P C
Format: Article
Language:English
Online Access:Get full text
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Summary: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.
ISSN:0295-5075
1286-4854