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University of Cambridge > Talks.cam > Quantum Matter Seminar > Tuning dimensionality, magnetism and conduction in van-der-Waals Mott insulators FeP(S,Se)3
Tuning dimensionality, magnetism and conduction in van-der-Waals Mott insulators FeP(S,Se)3Add to your list(s) Download to your calendar using vCal
If you have a question about this talk, please contact Mads Fonager Hansen. The van-der-Waals antiferromagnets TMPS3 , where TM = Transition Metal, form an ideal playground for tuning both low-dimensional magnetic and electronic properties . These are layered honeycomb antiferromagnetic Mott insulators, long studied as near-ideal 2D magnetic systems with a rich landscape of competing interactions and a variety of magnetic properties across the family. I will give an overview of my work using high pressure as a continuous tuning parameter to control the dimensionality of these 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. I will present magnetic, structural 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 scattering results, which have unveiled an enigmatic form of short-range magnetic order in metallic FePS3. This phase is particularly important as it most likely forms a precursor to superconductivity, and the direct observation of magnetism here completely overturns the existing wisdom in the literature 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 been observed. Finally I will describe our recent efforts to engineer magnetic frustration into this lattice, and discuss muon-spin-rotation measurements on some members of the family which give interesting hints towards complex magnetic behaviour. This talk is part of the Quantum Matter Seminar series. This talk is included in these lists:
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