Electronic structure and spontaneous internal field around non-magnetic   impurities in spin-triplet chiral p-wave superconductors
  The electronic structure around an impurity in spin triplet p-wave superconductors is studied by the Bogoliubov-de Gennes theory on a tight-binding model, where we have chosen $\sin{p_x}{+}{\rm i}\sin{p_y}$-wave or $\sin{(p_x+p_y)}{+}{\rm i}\sin{({-}p_x{+}p_y)}$-wave states which are considered to be candidates for the pairing state in Sr$_{2}$RuO$_{4}$.   We calculate the spontaneous current and the local density of states around the impurity and discuss the difference between the two types of pairing.   We propose that it is possible to discriminate the two pairing states by studying the spatial dependence of the magnetic field around a pair of impurities. 
Mitsuaki Takigawa, Masanori Ichioka, Kazuhiko Kuroki, and Yukio Tanaka