Fermi Surface of 3d1 Perovskite CaVO3 near the Mott Transition

We present a detailed de Haas-van Alphen effect study of the perovskite CaVO₃, offering an unprecedented test of electronic structure calculations in a 3d transition metal oxide. Our experimental and calculated Fermi surfaces are in good agreement, but only if we ignore large orthorhombic distortions of the cubic perovskite structure. Subtle discrepancies may shed light on an apparent conflict between the low energy properties of CaVO₃, which are those of a simple metal, and high energy probes which reveal strong correlations that place CaVO₃ on the verge of a metal-insulator transition.