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We present the observation of an isostructural Mott insulator-metaltransition in van-der-Waals honeycomb antiferromagnet V$_{0.9}$PS$_3$ throughhigh-pressure x-ray diffraction and transport measurements. The MPX$_3$ familyof magnetic van-der-Waals materials (M denotes a first row transition metal andX either S or Se) are currently the subject of broad and intense attention, butthe vanadium compounds have until this point not been studied beyond theirbasic properties. We observe insulating variable-range-hopping type resistivityin V$_{0.9}$PS$_3$, with a gradual increase in effective dimensionality withincreasing pressure, followed by a transition to a metallic resistivitytemperature dependence between 112 and 124 kbar. The metallic stateadditionally shows a low-temperature upturn we tentatively attribute to theKondo Effect. A gradual structural distortion is seen between 26-80 kbar, butno structural change at higher pressures corresponding to the insulator-metaltransition. We conclude that the insulator-metal transition occurs in theabsence of any distortions to the lattice - an isostructural Mott transition ina new class of two-dimensional material, and in strong contrast to the behaviorof the other MPX$_3$ compounds.

Isostructural Mott Transition in 2D honeycomb antiferromagnet V$_{0.9}$PS$_3$