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SUMMARY:Tunable anomalous Hall conductivity through volume-wise magnetic c
 ompetition in a topological kagome magnet
DTSTART;VALUE=DATE-TIME:20220829T164000Z
DTEND;VALUE=DATE-TIME:20220829T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T110605Z
UID:indico-contribution-3749@indico.stfc.ac.uk
DESCRIPTION:Speakers: Zurab Guguchia (Laboratory for Muon Spin Spectroscop
 y\, Paul Scherrer Institute\, CH-5232 Villigen PSI\, Switzerland)\nMagneti
 c topological phases of quantum matter are an emerging frontier in physics
  and material science. Along these lines\, several kagome magnets have app
 eared as the most promising platforms. Recently\, we explored magnetic cor
 relations in the kagome magnet Co$_{3}$Sn$_{2}$S$_{2}$ [1]. Using muon spi
 n-rotation (${\\mu}$SR) and ARPES\, we present evidence for competing magn
 etic orders in the topological kagome lattice of this compound. Our result
 s show that while the sample exhibits an out-of-plane ferromagnetic ground
  state\, an in-plane antiferromagnetic state appears at temperatures above
  90 K\, eventually attaining a volume fraction of 80% around 170 K\, b
 efore reaching a non-magnetic state. Strikingly\, the reduction of the ano
 malous Hall conductivity (AHC) above 90 K linearly follows the disappear
 ance of the volume fraction of the ferromagnetic state. We further show th
 at the competition of these magnetic phases is tunable through applying ei
 ther an external magnetic field or hydrostatic pressure. Our results taken
  together suggest the thermal and quantum tuning of Berry curvature induce
 d AHC via external tuning of magnetic order. ${\\mu}$SR played a crucial r
 ole in this study\, since it serves as an extremely sensitive local probe 
 for detecting small moments and ordered magnetic volume fractions in the b
 ulk of magnetic materials.  \n\n[1] Z. Guguchia et. al.\, Nature Communica
 tions $\\bf{11}$\, 559 (2020).\n\nhttps://indico.stfc.ac.uk/event/53/contr
 ibutions/3749/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3749/
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