Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 100: Frustrated Magnets - Pyrochlore Oxides
TT 100.8: Talk
Thursday, March 15, 2018, 17:30–17:45, H 3005
Frozen state and persistent spin dynamics of new kagome compound Fe4Si2Sn7O16: A µSR and AC-susceptibility study — •S. Dengre1, R. Sarkar1, J.-C. Orian2, C. Baines2, L. Opherden3, M. Uhlarz3, T. Herrmannsdörfer3, T. Söhnel4, M.C. Allison5, C.D. Ling5, J. Gardner6, and H.-H. Klauss1 — 1Institute of Solid State and Materials Physics, TU Dresden, D-01062 Dresden, Germany — 2Laboratory for Muon-Spin Spectroscopy, PSI, 5232 Villigen PSI, Switzerland — 3Dresden High Magnetic Field Laboratory, HZDR, D-01328 Dresden, Germany — 4School of Chemical Sciences, UOA, Auckland 1142, New Zealand — 5School of Chemistry, USYD Sydney 2006, Australia — 6Australian Centre for Neutron Scattering, ANSTO, Menai 2234, Australia
We present the results of a new kagome compound Fe4Si2Sn7O16 as probed by bulk AC-susceptibility and µSR experiments. Zero field (ZF) µSR spectra shows the presence of two relaxation channels with faster and slower relaxation rates (λ1, λ2) respectively. A peak in both λ1, λ2 is observed in the temperature range of 2-3 K associated with the static magnetism. λ1 exhibits a constant value below 1.5 K down to 270 mK indicating the presence of dynamic magnetism in the system. In AC-susceptibility, we observe a frequency dependent broad maximum which shifts from 3.5 K to 6 K (1.1 KHz). At low temperature below 0.15 K an upturn in the AC-susceptibility is evidenced. The combination of AC-susceptibility and µSR data suggests the presence of two relevant energy scales in Fe4Si2Sn7O16.