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We measured magnetization, specific heat, electron spin resonance, neutron diffraction, and inelastic neutron scattering of CrVMoO7 powder. An antiferromagnetically ordered state appears below TN = 26.5 ± 0.8 K. We consider that the probable spin model for CrVMoO7 is an interacting antiferromagnetic spin-3 2 dimer model. We evaluated the intradimer interaction J to be 25±1 K and the effective interdimer interaction J eff to be 8.8 ± 1 K. CrVMoO7 is a rare spin dimer compound that shows an antiferromagnetically ordered state at atmospheric pressure and zero magnetic field. The magnitude of ordered moments is 0.73(2)µB. It is much smaller than a classical value ∼ 3µB. Longitudinal-mode magnetic excitations may be observable in single crystalline CrVMoO7.

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