Abstract
Magnetic flux in superconductors is usually quantized in units of . Here we report scanning SQUID and scanning Hall probe studies of single fluxoids in high purity crystals ( ), extending flux quantization studies to a region of the cuprate phase diagram where the superfluid density is sufficiently low that novel behavior has been predicted. Some scenarios in which superconductivity results from spin-charge separation predict fluxoids in materials with low superfluid density. Our observations of only fluxoids set limits on these theories.
- Received 12 May 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.197002
©2001 American Physical Society