Carrier density independent scattering rate in SrTiO3-based electron liquids

Abstract

We examine the carrier density dependence of the scattering rate in two- and three-dimensional electron liquids in SrTiO3 in the regime where it scales with T^n (T is the temperature and n <= 2) in the cases when it is varied by electrostatic control and chemical doping, respectively. It is shown that the scattering rate is independent of the carrier density. This is contrary to the expectations from Landau Fermi liquid theory, where the scattering rate scales inversely with the Fermi energy (E_F). We discuss that the behavior is very similar to systems traditionally identified as non-Fermi liquids (n < 2). This includes the cuprates and other transition metal oxide perovskites, where strikingly similar density-independent scattering rates have been observed. The results indicate that the applicability of Fermi liquid theory should be questioned for a much broader range of correlated materials and point to the need for a unified theory.

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Cited by in corpus (20)

• Superconductivity in dilute SrTiO${}_3$: a review
• Optical response of correlated electron systems
• Electronic hydrodynamics and the breakdown of the Wiedemann-Franz and Mott laws in interacting metals
• Kinetic theory of transport for inhomogeneous electron fluids
• Electron hydrodynamics with a polygonal Fermi surface
• Electron-Phonon Coupling and Electron-Phonon Scattering in SrVO${}_3$
• Quasiparticle and Nonquasiparticle Transport in Doped Quantum Paraelectrics
• On the origin and the amplitude of T-square resistivity in Fermi liquids
• Resistivity bound for hydrodynamic bad metals
• Non-monotonic anisotropy in charge conduction induced by antiferrodistortive transition in metallic SrTiO${}_3$
• Heavy non-degenerate electrons in doped strontium titanate
• Conditions for $T^2$ resistivity from electron-electron scattering
• Low Temperature Specific Heat of Doped SrTiO${}_3$: Doping Dependence of the Effective Mass and Kadowaki-Woods Scaling Violation
• Thermoelectric La-doped SrTiO3 epitaxial layers with single-crystal quality: from nanometer to micrometer and mosaicity effects
• Charge transport in oxygen-deficient EuTiO${}_3$: the emerging picture of dilute metallicity in quantum-paraelectric perovskite oxides
• Unified modelling of the thermoelectric properties in SrTiO3
• Kinetic theory of electronic transport in random magnetic fields
• Effects of paramagnetic pair-breaking and spin-orbital coupling on multi-band superconductivity
• Disorder versus two transport lifetimes in a strongly correlated electron liquid
• Phonon-mediated spin transport in quantum paraelectric metals