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Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Frustrated Magnets - Spin Liquids - Experiments

TT 41.6: Talk

Tuesday, March 13, 2018, 11:45–12:00, H 3005

Frozen state and spin-gap behavior in a new kagome magnet Fe4Si2Sn7O16: An NMR study — •S. Dengre1, R. Sarkar1, M.C. Allision2, 3, T. Söhnel2, C.D. Ling3, J. Gardner4, and H.-H. Klauss11Institute of Solid State and Materials Physics, TU Dresden, 01062 Dresden, Germany — 2School of Chemical Sciences, University of Auckland, Auckland 1142, New Zealand — 3School of Chemistry, The University of Sydney, Sydney 2006, Australia — 4Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization, Menai 2234, Australia

Fe4Si2Sn7O16 is a new Fe based kagome system with a f=θ/TN≈3.6. The system consists of alternate stacking of kagome layer formed from edge sharing FeO6 (S = 2) and SnO6 octahedra and stannate layer FeSn6 (S = 0). Fe4Si2Sn7O16 is a classical homologue to a famous kagome compound herbertsmithite, a suitable candidate to realize quanum spin liquid phase. (117/119)Sn nuclear magnetic resonance (NMR) allows us to selectively probe the static and dynamic magnetism of different Fe-layers. While the NMR shift vs bulk susceptibility plot follows linear relation down to 10 K confirming the absence of foreign phases in the vicinity of kagome plane, the considerable line broadening below 10 K indicates the distribution of static internal field. NMR spin-lattice/spin relaxation rate (1/T1)/(1/T2) reflect the slowing down of spin fluctuations at ∼3 K associated with the static magnetism of Fe-kagome layer. Additionally, (1/T1) and (1/T2) temperature dependency show a spin-gap behavior with Δ∼6.5 K.
Ling et al. Phys. Rev. B 96, 180410(R).

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