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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Poster Session: Correlated Electrons 2

TT 50.13: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Anisotropy and spin dynamics in new kagome compound Fe4Si2Sn7O16 — •S. Dengre1, R. Sarkar1, J.-C. Orian2, C. Baines2, L. Opherden3, M. Uhlarz3, T. Herrmannsdörfer3, T. Söhnel4, C. D. Ling5, M. Allision5, J. Gardner6, and H.-H. Klauss11Institute of Solid State and Materials Physics, Technical University of Dresden, 01062 Dresden, Germany — 2Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland — 3Institute of Resource Ecology and Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany — 4School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand — 5School of Chemistry, The University of Sydney, Sydney 2006, Australia — 6Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization, Menai 2234, Australia

Fe4Si2Sn7O16 is a new Fe-based (S=2) kagome compound and a classical analogue of Herbertsmithite. In this work, we analyse Fe4Si2Sn7O16 using 119, 117Sn NMR, bulk AC - DC susceptibility and µSR. NMR reveals the planar anisotropic nature of the system . Moreover, with AC - DC susceptibility, we identify the presence 2 energy scales, i.e. a spin glass-like state at 3 K and a possible spin liquid state below 500 mK. Eventually, µSR results show a persistent spin dynamics down to 20 mK. In conclusion, we describe a compound characterised by the simultaneous presence of static and dynamic spins, which can serve as a model for further theoretical investigations.

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