Physics and Astronomy, Ames Laboratory
Journal or Book Title
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.
Bossoni, L.; Carretta, P.; Horvatić, M.; Corti, M.; Thaler, A.; and Canfield, Paul C., "Glassy transition in the vortex lattice of Ba(Fe0.93Rh0.07)(2)As-2 superconductor probed by NMR and ac-susceptibility" (2013). Physics and Astronomy Publications. 629.