Indications of Strange Metallicity encompassing High-Field Superconductivity in UTe₂

The vast majority of metals, whether strongly or weakly correlated, obey the laws of Fermi liquid theory at low temperatures, exemplified by a quadratic temperature dependence of resistivity. Fermi liquid theory posits that, even in a correlated metal, we can model interacting electrons as quasiparticles which retain most of the properties of the individual electrons. In recent years, a number of materials have been reported that display electronic properties that defy Fermi liquid theory, indicative of complex interaction processes driving a breakdown of the quasiparticle picture. Foremost, among the class of non-Fermi liquid materials, are strange metals. These exhibit temperature invariant scattering at the Planckian limit, which can be resolved as linear in temperature resistivity. In this talk, we present the observation of Planckian dissipation in UTe₂ in the vicinity of its magnetic field-reentrant superconducting regime which exists beyond a field-induced metamagnetic transition at > 40 T. Our measurements of strange metallicity accompanying field-induced triplet superconductivity at the border of a polarised magnetic regime reveal that UTe₂ hosts a novel environment for observation of Planckian dissipation, which is typically found at antiferromagnetic quantum critical points.