Hall effect in single crystal Ca2-xSrxRuO4

The mechanism by which the multiple-band metal Sr₂RuO₄ is transformed to the antiferromagnetic insulator Ca₂RuO₄ by isovalent substitution is not yet understood in detail, 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 Ca_2-xSr_xRuO₄ 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.