Severe Fermi Surface Reconstruction at a Metamagnetic-Transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$ (for $0.2\le x\le 0.5$)

Abstract

We report an electrical transport study in Ca${}_{2-x}$Sr${}_x$RuO${}_4$ single crystals at high magnetic fields ($B$). For $x=0.2$, the Hall constant $R_{xy}$ decreases sharply at an anisotropic metamagnetic (MM) transition reaching its value for Sr${}_2$RuO${}_4$ at high fields. A sharp decrease in the $A$ coefficient of the resistivity $T^2$-term and a change in the structure of the angular magnetoresistance oscillations (AMRO) for $B$ rotating in the planes, confirms the reconstruction of the Fermi surface (FS). Our observations and LDA calculations indicate a strong dependence of the FS on the Ca concentration and suggest the coexistence of itinerant and localized electronic states in single layered ruthenates.

arXiv comment5 pages, 4 figs

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