Direct measurements of field-dependent ordering in a low-field vortex glass state

Authors

Frederick Wells, University of WollongongFollow
Alexey V. Pan, University of WollongongFollow
X Renshaw Wang, University of Twente
Igor A. Golovchanskiy, University of WollongongFollow
Sergey Fedoseev, University of WollongongFollow
Hans Hilgenkamp, University of Twente
Anatoly B. Rosenfeld, University of WollongongFollow

RIS ID

106603

Publication Details

Wells, F. S., Pan, A. V., Wang, X. Renshaw., Golovchanskiy, I. A., Fedoseev, S. A., Hilgenkamp, H. & Rozenfeld, A. (2016). Direct measurements of field-dependent ordering in a low-field vortex glass state. IEEE Transactions on Applied Superconductivity, 26 (3), 8000905-1-8000905-5.

Abstract

The variation of topological defect density and hexatic order parameter were measured over a range of micro-Tesla fields in a 2-D superconducting vortex glass. This was achieved through scanning SQUID microscopy of the vortex distribution in YBa2Cu3O7−δ thin films under field-cooled conditions. It was discovered that, although 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.