You are here

    • You are here:
    • Home > ST480 - Direct Measurements of Field-Dependent Ordering in a Low-Field Vortex Glass State (Runner up)

ST480 - Direct Measurements of Field-Dependent Ordering in a Low-Field Vortex Glass State (Runner up)

Direct Measurements of Field-Dependent Ordering in a Low-Field Vortex Glass State

 
Frederick S. Wells1, Alexey V. Pan1, X. Renshaw Wang2,3,
Igor A. Golovchanskiy1,5,6, Sergey A. Fedoseev1,4, Hans Hilgenkamp2,
Anatoly Rozenfeld4
 
1Institute for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia
2Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
3Electrochemical Energy Laboratory, Massachusetts Institute of Technology,
Cambridge, MA 02139, USA
4Center for Medical Radiation Physics, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia
5Laboratory of Topological Quantum Phenomena in Superconducting Systems, Moscow Institute of Physics and Technology, State University, 9 Institutskiy per., Dolgoprudny, Moscow Region, 141700, Russia
6Laboratory of Superconducting Metamaterials, National University of Science and Technology MISIS, 4 Leninsky prosp., Moscow, 119049, Russia
 
Abstract — The variation of topological defect density and hexatic order parameter were measured over a range of micro-Tesla fields in a two-dimensional superconducting vortex glass. This was achieved through scanning SQUID microscopy of the vortex distribution in YBa2Cu3O7-δ thin films under fieldcooled conditions. It was discovered that while the defect density decreased for increasing magnetic fields, giving the impression
of a more lattice-like vortex distribution, the hexatic order parameter also decreased, showing that the distribution was less orientationally ordered
.
 
Keywords (Index Terms) — Flux pinning, superconducting thin films, yttrium barium copper oxide, scanning probe microscopy.
 
IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), January 2016. 
Submitted September 22, 2015; Selected November 10, 2015. Reference No. ST480; Category 5.
EUCAS 2015 preprint 2A-M-P-02.03. Submitted to IEEE Trans. Appl. Supercond. for possible publication.