New features in the microwave response of YBCO crystals: Evidence for a multi-component order parameter

Abstract

New features are reported in precision measurements of the complex microwave conductivity of high quality $YB{a}_{2}C{u}_3{O}_{6.95}$ crystals grown in $BaZr{O}_3$ crucibles. A third peak in the normal conductivity, ${\sigma }_1(T)$, at around $80K$, and enhanced pair conductivity ${\sigma }_2(T)$ below $\sim 65K$ 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 $YB{a}_{2}C{u}_3{O}_{6.95}$ and also provide a natural explanation to account for the low temperature $35K$ conductivity peak observed in all $YB{a}_{2}C{u}_3{O}_{6.95}$ crystals.

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

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