Volume 102, Number 1, April 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 April 2013|
Glassy transition in the vortex lattice of Ba(Fe0.93Rh0.07)2As2 superconductor probed by NMR and ac-susceptibility
1 Department of Physics, University of Pavia-CNISM - I-27100 Pavia, Italy, EU
2 Department of Physics “E. Amaldi”, University of Roma Tre-CNISM - I-00146 Roma, Italy, EU
3 Laboratoire National des Champs Magnétiques Intenses - LNCMI-CNRS (UPR3228), UJF, UPS and INSA BP 166, F-38042 Grenoble Cedex 9, France, EU
4 Ames Laboratory USDOE and Department of Physics and Astronomy, Iowa State University Ames, IA 50011, USA
Received: 17 December 2012
Accepted: 19 March 2013
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.
PACS: 74.25.nj – Nuclear magnetic resonance / 74.25.Uv – Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses) / 74.25.Wx – Vortex pinning (includes mechanisms and flux creep)
© EPLA, 2013
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