Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets III
TT 47.3: Vortrag
Dienstag, 1. April 2014, 14:30–14:45, HSZ 03
Microscopic magnetic modeling for the spin-1/2 kagome compound [NH4]2[C7H14N][V7O6F18] — •Oleg Janson1,2, Alexander Tsirlin1,2, Ioannis Rousochatzakis3, Helge Rosner1, and Raivo Stern2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2National Institute of Chemical Physics and Biophysics, Tallinn, Estonia — 3Leibniz Institute for Solid State and Materials Research, Dresden, Germany
In the recently synthesised compound [NH4]2[C7H14N][V7O6F18], magnetic S=1/2 V4+ atoms form an ideal kagome lattice [1]. Very recent µSR studies indicate the emergence of a gapless spin liquid state as a result of magnetic frustration [2]. Using density functional theory calculations, we address the microscopic magnetic model of this low-dimensional compound. We show that its peculiar symmetry gives rise to two inequivalent nearest-neighbor couplings. The behavior of the resulting quantum spin model is studied using exact diagonalization and compared to the experiments. OJ and AT were supported by the Mobilitas program of the ESF, grant numbers MJD447 and MTT77, respectively.
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