Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.65: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Magnetic and Structural Properties of the Trirutile-type 1D Heisenberg Antiferromagnet CuTa2O6 — •A. Golubev1, R. E. Dinnebier1, A. Schulz1, R.K. Kremer1, H. Langbein2, A. Senyshyn3, J. M. Law4, T. Hansen5, H.-J Koo6, and M.-H. Whangbo7 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Institut für Anorganische Chemie der Technischen Universität Dresden, Dresden, Germany — 3Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Garching, Germany — 4Dresden High Magnetic Field Laboratory (HLD), Dresden, Germany — 5Institut Laue-Langevin, Grenoble, France — 6Kyung Hee University, Seoul, Republic of Korea — 7North Carolina State University, North Carolina, USA
CuTa2O6 crystallizes with a monoclinically distorted trirutile structure type. By detailed high temperature neutron and x-ray powder diffraction measurements we mapped the structural phase transition to the tetragonal trirutile structure-type at 500 K. The structural phase transition was ascertained by Raman scattering experiments. ab-initio GGA+U density functional calculations of the spin exchange parameters, magnetic susceptibility and isothermal magnetization measurements constitute CuTa2O6 as one-dimensional Heisenberg quantum antiferromagnet with predominant nearest-neighbor spin exchange interaction J−nn 50 K. Long-range magnetic order was not detected down to 0.4K.