Direct observation of the flux-line vortex glass phase in a type II superconductor
U. Divakar, A.J. Drew, S.L. Lee, R. Gilardi, J. Mesot, F.Y. Ogrin, D., Charalambous, E.M. Forgan, G.I. Menon, N. Momono, M. Oda, C.D. Dewhurst and, C. Baines
TL;DR
This paper provides direct experimental evidence of the vortex glass phase in a type II superconductor, revealing a transition from an ordered Bragg glass to a disordered vortex glass using muon spin rotation and neutron scattering.
Contribution
It is the first to observe and characterize the vortex glass phase transition in La_{1.9}Sr_{0.1}CuO_{4} using direct microscopic techniques.
Findings
Transition from Bragg glass to vortex glass observed
Disordered vortex lines characterize the vortex glass phase
Thermal and pinning effects influence the transition
Abstract
The order of the vortex state in La_{1.9} Sr_{0.1} CuO_{4} is probed using muon spin rotation and small-angle neutron scattering. A transition from a Bragg glass to a vortex glass is observed, where the latter is composed of disordered vortex lines. In the vicinity of the transition the microscopic behavior reflects a delicate interplay of thermally-induced and pinning-induced disorder.
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