Regensburg 2016 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 42: Correlated Electrons: Frustrated Magnets - Cu-based Systems & FeCr
TT 42.8: Talk
Wednesday, March 9, 2016, 11:30–11:45, H18
Investigation of the antiferromagnetic - ferromagnetic dimer chain compound BaCu2V2O8 at zero and finite temperatures — •Ekaterina Klyushina1,2, Alexander Tiegel3, Nazmul Islam1, Benedikt Fauseweh6, Jitae Park4, Bastian Klemke1, Andreas Honecker5, Götz Uhrig6, Salvatore Manmana3, and Bella Lake1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, Germany — 3Georg-August-Universität Göttingen, Germany — 4Heinz Maier-Leibnitz Zentrum, TU München, Garching, Germany — 5Université de Cergy-Pontoise, France — 6Technische Universität Dortmund, Germany
Highly dimerized quantum magnets have attracted a great deal of attention in the recently due to the unconventional temperature behavior of their magnetic excitations[1,2].
Here we present our investigations of the highly dimerized antiferromagnet-ferromagnetic 1D chain BaCu2V2O8 both at base and at finite temperatures. The single crystal inelastic neutron scattering measurements at base temperature reveal that there are two excitation branches which disperse along the L direction over the energy range of 36-46 meV. The comparison with DMRG simulations indicates that the antiferromagnetic dimers are coupled ferromagnetically along the c axis. The line shape of the excitations at the dispersion minima was found to become asymmetry with increasing temperature. Thus unconventional thermal behavior also exists in dimer compounds with ferromagnetic interdimer coupling.
D. L. Quintero-Castro et al., PRL 109, 127206 (2012)
D. Tennant et al., PRB 85, 014402 (2012).