Hall effect in single crystal Ca_2-xSr_xRuO₄

The mechanism by which the multiple-band metal Sr2RuO4 is transformed to the antiferromagnetic insulator Ca2RuO4 by isovalent substitution is not yet understood in derail, but strong electron correlations play a key role. In an effort to probe the effect of the substitution, we have performed a study of the Hall effect in the Ca2-xSrxRuO4 system. We argue that the results give information on the Fermi surface topography, and hence place useful constraints on theories of the evolution of the electronic structure with varying x