Testing the Berry phase model for extraordinary Hall effect in SrRuO3
  Recently it has been suggested that the complicated temperature dependence of the extraordinary Hall effect (EHE) in the itinerant ferromagnet SrRuO3 could be explained by the Berry phase effect in the crystal momentum space. We test this model by measurements of EHE as a function of an applied magnetic field at a constant temperature and show that the results seem to contradict the Berry phase mechanism. 
Yevgeny Kats, Isaschar Genish, Lior Klein, James W. Reiner, M. R.   Beasley