Magnetotransport of dirty-limit van Hove singularity quasiparticles
Yang Xu, František Herman, V. Granata, D. Destraz, Lakshmi Kanta Das, Jakub Vonka, Simon Gerber, Jonathan Spring, Marta Gibert, A. Schilling, Xiaofu Zhang, Shiyan Li, R. Fittipaldi, Mark H. Fischer, A. Vecchione, J. Chang
Abstract
Tuning of electronic density-of-states singularities is a common route to unconventional metal physics. Conceptually, van Hove singularities are realized only in clean two-dimensional systems. Little attention has therefore been given to the disordered (dirty) limit. Here, we provide a magnetotransport study of the dirty metamagnetic system calcium-doped strontium ruthenate. Fermi liquid properties persist across the metamagnetic transition, but with an unusually strong variation of the Kadowaki-Woods ratio. This is revealed by a strong decoupling of inelastic electron scattering and electronic mass inferred from density-of-state probes. We discuss this Fermi liquid behavior in terms of a magnetic field tunable van Hove singularity in the presence of disorder. More generally, we show how dimensionality and disorder control the fate of transport properties across metamagnetic transitions.