It is found that a small distortion caused by magnetostriction and a structural phase transition caused by Jahn-Teller distortion are continuously connected in ${\mathrm{Co}}_{1-x}{\mathrm{Fe}}_x{\mathrm{V}}_2{\mathrm{O}}_4$ under variation of $x$. Spin-orbit coupling in Jahn-Teller-active ${\mathrm{Fe}}^{2+}$ ions gives rise to this novel correlation between spins, orbitals, and the lattice distortion in this series of compounds.

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• Jahn-Teller effect
• Ferrimagnets
• Magnetization measurements
• Thermodilatometry