Gap Symmetry of Superconductivity in UPd2Al3
arXiv:cond-mat/0407271 · doi:10.1103/PhysRevB.70.140509
Abstract
The angle dependent thermal conductivity of the heavy-fermion superconductor UPd$_2$Al$_3$ in the vortex state was recently measured by Watanabe et al. Here we analyze this data from two perspectives: universal heat conduction and the angle-dependence. We conclude that the superconducting gap function $Î({\bf k})$ in UPd$_2$Al$_3$ has horizontal nodes and is given by $Î({\bf k}) =Î\cos(2Ï)$, with $Ï= ck_{z}$.
8 pages, 4 figures, improved figures in replacement