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Coupling of charge and lattice degrees of freedom in materials can produceintriguing electronic phenomena, such as conventional superconductivity wherethe electrons are mediated by lattice for creating supercurrent. The Motttransition, which is a source for many fascinating emergent behaviors, isoriginally thought to be driven solely by correlated electrons with an Isingcriticality. Recent studies on the known Mott systems have shown that thelattice degree of freedom is also at play, giving rise to either Landau orunconventional criticality. However, the underlying coupling mechanism ofcharge and lattice degrees of freedom around the Mott critical endpoint remainselusive, leading to difficulties in understanding the associated Mott physics.Here we report a study of Mott transition in cubic PbCrO3 by measuring thelattice parameter, using high-pressure x-ray diffraction techniques. The Mottcriticality in this material is revealed with large lattice anomalies, which isgoverned by giant viscoelasticity that presumably results from a combination oflattice elasticity and electron viscosity. Because of the viscoelastic effect,the lattice of this material behaves peculiarly near the critical endpoint,inconsistent with any existing university classes. We argue that theviscoelasticity may play as a hidden degree of freedom behind the Mottcriticality.

Giant viscoelasticity near Mott criticality in PbCrO3 with large lattice anomalies