Analysis of low-field isotropic vortex glass containing vortex groups in YBCO thin films visualized by scanning SQUID microscopy

The glass-like vortex distribution in pulsed laser deposited YBCO thin films is observed by scanning superconducting quantum interference device microscopy and analysed for ordering after cooling in magnetic fields significantly smaller than the Earth's field. Autocorrelation calculations on th...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2018-07
Main Authors: Wells, Frederick S, Pan, Alexey V, X Renshaw Wang, Fedoseev, Sergey A, Hilgenkamp, Hans
Format: Article
Language:English
Subjects:
Delaunay triangulation
Glass
Magnetic fields
Microscopy
Pulsed laser deposition
Pulsed lasers
Superconducting quantum interference devices
Thin films
Vortices
YBCO superconductors
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The glass-like vortex distribution in pulsed laser deposited YBCO thin films is observed by scanning superconducting quantum interference device microscopy and analysed for ordering after cooling in magnetic fields significantly smaller than the Earth's field. Autocorrelation calculations on this distribution show a weak short-range positional order, while Delaunay triangulation shows a near-complete lack of orientational order. The distribution of these vortices is finally characterised as an isotropic vortex glass. Abnormally closely spaced groups of vortices, which are statistically unlikely to occur, are observed above a threshold magnetic field. The origin of these groups is discussed, but will require further investigation.
ISSN:2331-8422
DOI:10.48550/arxiv.1807.06746