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The ferrimagnetic spinel $\mathrm{CoV_2O_4}$ has been a topic of intenserecent interest, both as a frustrated insulator with unquenched orbitaldegeneracy and as a near-itinerant magnet which can be driven metallic withmoderate applied pressure. Here, we report on our recent neutron diffractionand inelastic scattering measurements on powders with minimal cation sitedisorder. Our main new result is the identification of a weak ($\frac{\Deltaa}{a} \sim 10^{-4}$), first order structural phase transition at $T^*$ = 90 K,the same temperature where spin canting was seen in recent single crystalmeasurements. This transition is characterized by a short-range distortion ofoxygen octahedral positions, and inelastic data further establish a weak$\Delta\sim 1.25 meV$ spin gap at low temperature. Together, these findingsprovide strong support for the local orbital picture and the existence of anorbital glass state at temperatures below $T^*$.

Structural transition and orbital glass physics in near itinerant CoV2O4