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TT: Fachverband Tiefe Temperaturen

TT 50: Correlated Electrons: Frustrated Magnets - Theory

TT 50.11: Vortrag

Mittwoch, 9. März 2016, 18:00–18:15, H18

Heisenberg antiferromagnets on the hexagonal bilayer with interlayer frustration — •Boris Celan and Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig

Frustrated single layer Heisenberg antiferromagnets on the hexagonal lattice have seen an upsurge of interest. Recently also a bilayer system, i.e. Bi₃Mn₄O₁₂(NO₃), with possibly interlayer frustration has come under scrutiny. For this material S=3/2, rendering spin wave analysis a viable approach. We present results of a selfconsistent spin wave calculation for the hexagonal Heisenberg bilayer up to second order in 1/S, explicitly taking into account the impact of interlayer frustration. Findings for the quantum phase diagram, the local moments, the ground state energies, and the magnon dispersions versus the exchange interactions will be discussed. Our results will be contrasted against those obtained from methods applied to the quantum limit S=1/2.