Comment:on possible time reversal symmetry breaking in normal state of   ruthenate
  A spiral spin structure with a nesting vector is expected to be the ground normal state of $Sr_2RuO_4$. It might be observable with use of the ARPES method with circularly polarised photons desighned by A.Kaminsky et al. (cond-mat/0203133). 
A.A. Ovchinnikov, M.Ya. Ovchinnikova