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SUMMARY:Tuning dimensionality\, magnetism and conduction in van-der-Waals 
 Mott insulators FeP(S\,Se)3 - Dr. Matthew Coak (School of physics and astr
 onomy\, University of Birmingham)
DTSTART:20250122T111500Z
DTEND:20250122T120000Z
UID:TALK225133@talks.cam.ac.uk
CONTACT:Mads Fonager Hansen
DESCRIPTION:The van-der-Waals antiferromagnets TMPS3\, where TM = Transiti
 on Metal\, form an ideal playground for tuning both low-dimensional magnet
 ic and electronic properties . These are layered honeycomb antiferromagnet
 ic Mott insulators\, long studied as near-ideal 2D magnetic systems with a
  rich landscape of competing interactions and a variety of magnetic proper
 ties across the family. I will give an overview of my work using high pres
 sure as a continuous tuning parameter to control the dimensionality of the
 se materials. Due to the weak physical inter-planar forces in such van-der
 -Waals materials\, pressure gives us clean and selective control over the 
 interplanar spacing and hence interactions.\n\nI will present magnetic\, s
 tructural and electrical transport results and compare the behaviour of Fe
 -\, V-\, Mn- and NiPS3 as we tune them towards 3D structures – and Mott 
 transitions from insulator to metal. I show multiple enigmatic features in
  electrical transport in this ‘strange metal’ high pressure regime. I 
 will focus in particular upon our recent ultra-high pressure neutron scatt
 ering results\, which have unveiled an enigmatic form of short-range magne
 tic order in metallic FePS3. This phase is particularly important as it mo
 st likely forms a precursor to superconductivity\, and the direct observat
 ion of magnetism here completely overturns the existing wisdom in the lite
 rature of a spin-crossover transition as the Fe local environment changes.
  I will contrast these measurements with our recent equivalent results on 
 sister compound FePSe3\, in which superconductivity has in fact recently b
 een observed.\n\nFinally I will describe our recent efforts to engineer ma
 gnetic frustration into this lattice\, and discuss muon-spin-rotation meas
 urements on some members of the family which give interesting hints toward
 s complex magnetic behaviour.
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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