We report measurements of the low field structure of the magnetic vortex lattice in an untwinned YBCO single-crystal platelet. Measurements were carried out using a novel atomic beam magnetic resonance (ABMR) technique. For a 10.7 G field applied parallel to the c-axis of the sample, we find a triangular lattice with orientational order extending across the entire sample. We find the triangular lattice to be weakly distorted by the a-b anisotropy of the material and measure a distortion factor, f = 1.16. Model-experiment comparisons determine a penetration depth, lambda_ab = 140 (+-20) nm. The paper includes the first detailed description of the ABMR technique. We discuss both technical details of the experiment and the modeling used to interpret the measurements.
@article{arxiv.cond-mat/0209150,
title = {Low field vortex matter in YBCO: an atomic beam magnetic resonance study},
author = {Harald Hauglin and Nathan G. Woodard and Samuel Dapore-Schwartz and Gregory P. Lafyatis},
journal= {arXiv preprint arXiv:cond-mat/0209150},
year = {2009}
}
Comments
44 pages, 13 figures, submitted to Phys. Rev. B Revision includes Postscript wrapped figures + minor typos