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SUMMARY:Low temperature spin dynamics in the $S = 2$ kagome magnet Fe$_4$S
 i$_2$Sn$_7$O$_{16}$: An AC susceptibility\, NMR and µSR study
DTSTART;VALUE=DATE-TIME:20220830T164000Z
DTEND;VALUE=DATE-TIME:20220830T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T120727Z
UID:indico-contribution-3738@indico.stfc.ac.uk
DESCRIPTION:Speakers: Rajib Sarkar (TU Dresden)\nFe4Si2Sn7O16 displays an 
 undistorted kagome lattice of Fe2+ (3d6\, S = 2) ions. We present results 
 of DC-pulse-field magnetisation up to 50 T\, Nuclear Magnetic Resonance (N
 MR)\, AC-susceptibility and muon-spin-resonance (µSR) measurements down t
 o 19 mK on powder sample of Fe4Si2Sn7O16. The magnetization measurement at
  2 K excludes the presence of strong Ising anisotropies. In the temperatur
 e range of 3 K to 8 K\, the maximum in the real part of AC-susceptibility 
 shows frequency-dependent shift and indicates the presence of spin-glass-l
 ike behavior. An additional frequency-independent magnetic regime is obser
 ved below T = 0.7 K. The transverse-field and zero-field µSR results show
  the onset of static magnetic correlations below 30 K. Further\, below T =
  1 K\, ZF-relaxation rate remains relatively constant which indicates the 
 presence of persistence spin dynamics down to 19 mK. Based on the longitud
 inal field decoupling µSR studies\, we discuss the coexistence of static 
 and dynamic magnetic correlations below 250 mK. From our combined AC-susce
 ptibility and µSR results\, we demonstrate that in Fe4Si2Sn7O16 the dynam
 ic magnetic correlations increase below 250 mK and a possible gapless-spin
 -liquid behavior is achieved.\n\nhttps://indico.stfc.ac.uk/event/53/contri
 butions/3738/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3738/
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