New features are reported in precision measurements of the complex microwave conductivity of high quality YBa2Cu3O6.95 crystals grown in BaZrO3 crucibles. A third peak in the normal conductivity, σ1(T), at around 80K, and enhanced pair conductivity σ2(T) below ∼65K are observed. The data are inconsistent with a single order parameter, and instead are indicative of multi-component superconductivity. Overall, these results point to the presence of multiple pairing interactions in YBa2Cu3O6.95 and also provide a natural explanation to account for the low temperature 35K conductivity peak observed in all YBa2Cu3O6.95 crystals.
@article{arxiv.cond-mat/9610032,
title = {New features in the microwave response of YBCO crystals: Evidence for a multi-component order parameter},
author = {H. Srikanth and Balam A. Willemsen and T. Jacobs and S. Sridhar and A. Erb and E. Walker and R. Flukiger},
journal= {arXiv preprint arXiv:cond-mat/9610032},
year = {2016}
}
Comments
4 pages 4 figures, Revtex, multicols [to appear in Phys. Rev. B (Rapid Comm)]. Our preprints also available at http://sagar.physics.neu.edu/preprints.html