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Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: Correlated Electrons: Frustrated Magnets - Low-Dimensional Systems

TT 50.9: Talk

Wednesday, March 22, 2017, 17:15–17:30, HSZ 304

Structural and Magnetic Properties of the trirutile-type 1D Heisenberg Antiferromagnet CuTa2O6 — •Aleksandr Golubev1, R. E. Dinnebier1, A. Schulz1, R. K. Kremer1, H. Langbein2, A. Senyshyn3, J. M. Law4, Th. Hansen5, E. E. Gordon6, and M.-H. Whangbo61MPI for Solid State Research, D-70569 Stuttgart, Germany — 2Institut für Anorganische Chemie der TUD, D-01062 Dresden, Germany — 3Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), TUM, D-85747 Garching, Germany — 4Dresden High Magnetic Field Laboratory (HLD), D-01314 Dresden-Rossendorf, Germany — 5ILL, B.P. 156, 38043 Grenoble, France — 6Department of Chemistry, NCSU, Raleigh, North Carolina 27695-8204, USA

Polycrystalline samples of CuTa2O6 prepared by low-temperature decomposition of Cu-Ta-oxalate precursors at room temperature crystallize with a monoclinically distorted trirutile structure type. By detailed high temperature x-ray and neutron powder diffraction studies we detected a structural phase transition to the tetragonal trirutile structure-type at 503(3) K. The structural phase transition was ascertained by Raman scattering. GGA+U DFT calculations of the spin exchange parameters, magnetic susceptibility and isothermal magnetization measurements constitute CuTa2O6 as new 1D Heisenberg chain with predominant afm nearest neighbor exchange interaction Jnn ≈ 50 K. Heat capacity and low temperature high intensity neutron powder diffraction studies could not find long range order down to 0.4K.

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