Dresden 2020 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Frustrated Magnets - Spin Liquids 1 (joint session TT/MA)
MA 22.9: Vortrag
Dienstag, 17. März 2020, 11:45–12:00, HSZ 304
Probing anisotropic static and dynamic magnetic interactions of Fe-kagome Fe4Si2Sn7O16 by bulk magnetisation and NMR — •S. Dengre1, R. Sarkar1, L. Opherden2, M. Uhlarz2, T. Herrmannsdörfer2, M. Allison.3, T. Söhnel3, C.D. Ling4, J Gardner5, and H.-H. Klauss1 — 1Institute of Solid State and Materials Physics, TU Dresden, 01062 Dresden, Germany — 2Institute of Resource Ecology and Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany — 3School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand — 4School of Chemistry, The University of Sydney, Sydney 2006, Australia — 5Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization, Menai 2234, Australia
Fe4Si2Sn7O16 hosts an undistorted kagome lattice with Fe2+ (3d6, S = 2) spins. We present results on oriented and unoriented powder samples. The bulk magnetic susceptibility shows the presence of strong planar (XY) rather than Ising anisotropy. Both static NMR shift (K) and dynamic spin-lattice relaxation rate (1/T1) NMR reveal a highly anisotropic behaviour in ∥ and ⊥ orientation of the external field with respect to the Kagome planes. For ∥ orientation, the NMR shift (K) scales linearly with the bulk susceptibility for temperatures ranging from 100 K to 4 K. The NMR shift in ⊥ orientation shows the onset of AFM correlations at T ≈ 30 K by a deviation from the linear scaling. This is also reflected in the 1/T1 for ∥ orientation, which starts to decrease at T ≈ 30 K.