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Intermediate-scale Theory for Electrons Coupled to Frustrated Local-moments by McRoberts, Adam J.; Mendez-Valderrama, J. F.; Moessner, Roderich; Chowdhury, Debanjan is a scholarly article available to read on EtoBox.

What is Intermediate-scale Theory for Electrons Coupled to Frustrated Local-moments about?

A classic route for destroying long-lived electronic quasiparticles in a weakly interacting Fermi liquid is to couple them to other low-energy degrees of freedom that effectively act as a bath. We consider here the problem of electrons scattering off the spin fluctuations of a geometrically frustrated antiferromagnet, whose non-linear Landau-Lifshitz dynamics, which remains non-trivial at all temperatures, we model in detail. At intermediate temperatures and in the absence of any magnetic ordering, the fluctuating local-moments lead to a non-trivial angular anisotropy of the scattering-rate along the Fermi surface, which disappears with increasing temperature, elucidating the role of "hot-spots". Over a remarkably broad window of intermediate and high temperatures, the electronic properties can be described by employing a local approximation for the dynamical spin-response. This we contrast with the more familiar setup of electrons scattering off classical phonons, whose high-temperature limit differs fundamentally on account of their unbounded Hilbert space. We place our results in the context of layered magnetic delafossite compounds.

Author

McRoberts, Adam J.; Mendez-Valderrama, J. F.; Moessner, Roderich; Chowdhury, Debanjan

Published

2022

Language

EN