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Glassy transition in the vortex lattice of Ba(Fe0.93Rh0.07)(2)As-2 superconductor probed by NMR and ac-susceptibility

TitleGlassy transition in the vortex lattice of Ba(Fe0.93Rh0.07)(2)As-2 superconductor probed by NMR and ac-susceptibility
Publication TypeJournal Article
Year of Publication2013
AuthorsBossoni, L, Carretta, P, Horvatic, M, Corti, M, Thaler, A, Canfield, PC
JournalEpl
Volume102
Pagination17005
Date Published04
Type of ArticleArticle
ISBN Number0295-5075
Accession NumberWOS:000319607500026
Keywordsdynamics, high-temperature superconductors, melt, model, phase, relaxation, state, vortices
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 he 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. Copyright (C) EPLA, 2013

DOI10.1209/0295-5075/102/17005
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