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V2O3 famously features all four combinations of paramagnetic vsantiferromagnetic, and metallic vs insulating states of matter in response to%-level doping, pressure in the GPa range, and temperature below 300 K. Usingtime-of-flight neutron spectroscopy combined with density functional theorycalculations of magnetic interactions, we have mapped and analyzed theinelastic magnetic neutron scattering cross section over a wide range of energyand momentum transfer in the chromium stabilized antiferromagnetic andparamagnetic insulating phases (AFI & PI). Our results reveal an importantmagnetic frustration and degeneracy of the PI phase which is relieved by therhombohedral to monoclinic transition at $T_N=185$ K due to a significantmagneto-elastic coupling. This leads to the recognition that magneticfrustration is an inherent property of the paramagnetic phase in $\rm(V_{1-x}Cr_x)_2O_3$ and plays a key role in suppressing the magnetic long rangeordering temperature and exposing a large phase space for the paramagnetic Mottmetal-insulator transition to occur.

Frustrated Magnetism in Mott Insulating (V$_{1-x}$Cr$_x$)$_2$O$_3$