Limits on spin-charge separation from h/2e fluxoids in very underdoped YBa2Cu3O(6+x)

J C Wynn; D A Bonn; B W Gardner; Y J Lin; R Liang; W N Hardy; J R Kirtley; K A Moler

doi:10.1103/PhysRevLett.87.197002

Limits on spin-charge separation from h/2e fluxoids in very underdoped YBa2Cu3O(6+x)

Phys Rev Lett. 2001 Nov 5;87(19):197002. doi: 10.1103/PhysRevLett.87.197002. Epub 2001 Oct 16.

Authors

J C Wynn¹, D A Bonn, B W Gardner, Y J Lin, R Liang, W N Hardy, J R Kirtley, K A Moler

Affiliation

¹ Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.

PMID: 11690445
DOI: 10.1103/PhysRevLett.87.197002

Abstract

Magnetic flux in superconductors is usually quantized in units of h/2e. Here we report scanning SQUID and scanning Hall probe studies of single fluxoids in high purity YBa2Cu3O6.35 crystals (T(c) less, similar 13 K), 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 h/e fluxoids in materials with low superfluid density. Our observations of only h/2e fluxoids set limits on these theories.