Fractional impurity moments in two-dimensional non-collinear magnets

Details Fractional impurity moments in two-dimensional non-collinear magnets Fractional impurity moments in two-dimensional non-collinear magnets

2011-04-26

arxiv.org/abs/1104.5018v1

Phys. Rev. Lett. 107, 137204 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figs

Scientific paper

10.1103/PhysRevLett.107.137204

We study dilute magnetic impurities and vacancies in two-dimensional frustrated magnets with non-collinear order. Taking the triangular-lattice Heisenberg model as an example, we use quasiclassical methods to determine the impurity contributions to the magnetization and susceptibility. Most importantly, each impurity moment is not quantized, but receives non-universal screening corrections due to local relief of frustration. At finite temperatures, where bulk long-range order is absent, this implies an impurity-induced magnetic response of Curie form, with a prefactor corresponding to a fractional moment per impurity. We also discuss the behavior in an applied magnetic field, where we find a singular linear-response limit for overcompensated impurities, and propose experiments to test our theory.

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