Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session D40: Superconductivity: Vortices
2:30 PM–5:30 PM,
Monday, March 15, 2010
Sponsoring Unit: DCMP
Chair: Milind Kunchur, University of South Carolina
Abstract ID: BAPS.2010.MAR.D40.9
Abstract: D40.00009 : Slicing through a bulk vortex matter using neutron reflectometry: observation of a vortex crystal (Bragg glass) with dirty edge states.*
4:06 PM–4:18 PM
Preview Abstract Abstract
It is now widely accepted that the ground state of the vortex matter in weak-pinning type-II superconductors is a topologically ordered Bragg Glass (BrG) phase. An unresolved issue is how to access the equilibrium state of the BrG phase. For example, in some samples, the ZFC (zero-field-cooled) states are more ordered than that of the FC (field-cooled) states, while in seemingly similar samples, the opposite is true. In this work, we use neutron reflectometry in the diffraction mode to measure thin slices of the bulk vortex state prepared under various thermal-magnetic history. We found that in a sample with disordered ZFC states, but more ordered FC states, the vortex matter is highly inhomogeneous. We found that after repeated thermal annealing, a large domain of the BrG phase exists in the center of the sample, while the edge vortex matter remains disordered. Our results also provide additional insight into the disappearance of the peak effect.
*This work is supported by a grant from the US Department of Energy.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.D40.9
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700