Tuning dimensionality through pressure in layered antiferromagnetic Mott insulators
The honeycomb two-dimensional antiferromagnets TM PS 3 , where TM = Transition Metal and, form an ideal playground for tuning both low-dimensional magnetic and electronic properties. I will give an overview of our 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 inter-planar spacing and hence interactions. I will present magnetic, structural and electrical transport results and compare the behaviour of Fe-, V-, Mn- and NiPS 3 as we tune them towards 3D structures – and Mott transitions from insulator to metal. I will focus in particular upon recent results on the pressure-tuned Raman spectra and ultra-high-pressure neutron scattering, which has unveiled an enigmatic form of short-range magnetic order in metallic FePS 3 .
Host: Prof. Je-Geun Park