Abstract: New aspects of the strange metal phase of overdoped cuprates
Upon doping the cuprate parent insulator, a dome of high-temperature superconductivity is formed. On the underdoped (low-doped) side of the dome, the physics is dominated by the normal state pseudogap which closes at a critical doping level near the top of the dome. For a long time, it was believed that once the pseudogap had closed, the electronic state became more conventional and Fermi-liquid-like. In light of more recent experiments, however, the region beyond p* has now become recognised for its strangeness, characterised by an in-plane resistivity ρab(T) with an anomalous T-linear component at low-T and exhibits signatures of so-called Planckian dissipation. Other notable features of the cuprate 'strange metal' regime include a suppressed Hall carrier density, an anomalous form of hyperbolic (H/T ) scaling in the magnetoresistance and critical (ω/T ) scaling of the optical conductivity σ(ω). Crucially, none of these observations support the notion that a Fermi-liquid state is recovered once the pseudogap itself closes. In this talk, I will present new experimental observations from our group that provide some relevant new insights into the nature of the cuprate strange metal, most notably, concerning the presence two distinct types of electron fluid. If time permits, I will speculate on the possible origin of this dual character and which of these fluids constitutes the bulk of the superfluid condensate.
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