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. Klauss¹ — ¹Institute 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, 117}Sn 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.