Spin dynamics and two-dimensional correlations in the fcc antiferromagnetic Sr2YRuO6

Abstract: The face-centered-cubic (fcc) lattice of Ru5+ spins in the double perovskite Sr2YRuO6 shows a delicate, three-dimensional antiferromagnetic (AFM) ground state composed of stacked square AFM layers. Inelastic neutron scattering data taken on this state reveal a gapped low-energy excitation band emerging from [001] with spin excitations extending to 8meV. These magnetic excitations are modeled by a simple J(1)-J(2) interaction scheme allowing quantitative comparisons with similar materials. At higher temperatures, the low-energy excitation spectrum is dominated by a quasielastic component associated with size fluctuations of two-dimensional AFM clusters that exhibit asymmetric correlations even at low temperatures. Thus, the fcc lattice in general and the double-perovskite structure in particular emerge as hosts of both two-dimensional and three-dimensional dynamics resulting from frustration.

Author(s): Disseler, S. M.; Lynn, J. W.; Jardim, R. F.; et al.

Physical Review B

Volume: 93 Issue: 14 Published: 2016

DOI: http://dx.doi.org/10.1103/PhysRevB.93.140407

PDF: Spin dynamics and two-dimensional correlations in the fcc antiferromagnetic Sr2YRuO6