| Despite overwhelming experimental evidence supporting the realization of chiral p-wave pairing in the unconventional superconductor Sr2RuO4, recently a renewed debate on the order parameter symmetry has been triggered by apparently contradictory experiments. This talk givea an overview on the important points of this debate: (1) Chirality implies specific magnetic properties which are seemingly compatible with mSR, Kerr rotation and Josephson effect, but seem to absent in direct measurements of surface currents; (2) The apparent d-vector rotation in a magnetic field as suggested by NMR measurements; (3) unexpected limiting behavior of the upper critical field. Moreover, experiments of the inhomogeneous 3-Kelvin phase in Sr2RuO4-Ru eutectics will be analyzed in view of the pairing symmetry. |
|