In the last few years the gap symmetries of many new superconductors,including Sr$_2$RuO$_4$, CeCoIn$_5$, $\kappa$-(ET)$_{ 2}$Cu(NCS)$_{ 2}$, YNi$_{ 2}$B$_{ 2}$C and PrOs$_{ 4}$Sb$_{ 12}$, have been identified via angle-dependent magnetothermal conductivity measurements. However, a controversy still persists as to the nature of the superconductivity in Sr$_2$RuO$_4$. For PrOs$_{ 4}$Sb$_{ 12}$, spin-triplet superconductivity has recently been proposed. Here, we also propose g-wave superconductivity for UPd$_2$Al$_3$ (i.e., $\Delta({ \bf k})=\Delta\cos(2\chi), \chi = ck_{ z}$) based on recent thermal conductivity data.
Categories: cond-mat.supr-con