# Magnetism of the antiferromagnetic spin-$\frac{3}{2}$ dimer compound CrVMoO$_7$ having an antiferromagnetically ordered state

## TL;DR

This study investigates the magnetic properties of the antiferromagnetic spin-3/2 dimer compound CrVMoO$_7$, revealing its ordered state, exchange interactions, and potential for observing longitudinal magnetic excitations.

## Contribution

It provides the first detailed experimental characterization of CrVMoO$_7$'s magnetic behavior and proposes a spin model with specific exchange interactions.

## Key findings

- Antiferromagnetic order below 26.5 K
- Intradimer interaction J = 25 K
- Ordered magnetic moments are 0.73 μ_B

## Abstract

We measured magnetization, specific heat, electron spin resonance, neutron diffraction, and inelastic neutron scattering of CrVMoO$_7$ powder. An antiferromagnetically ordered state appears below $T_{\rm N} = 26.5 \pm 0.8$ K. We consider that the probable spin model for CrVMoO$_7$ is an interacting antiferromagnetic spin-$\frac{3}{2}$ dimer model. We evaluated the intradimer interaction $J$ to be $25 \pm 1$ K and the effective interdimer interaction $J_{\rm eff}$ to be $8.8 \pm 1$ K. CrVMoO$_7$ 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 $0.73(2) \mu_{\rm B}$. It is much smaller than a classical value $\sim 3 \mu_{\rm B}$. Longitudinal-mode magnetic excitations may be observable in single crystalline CrVMoO$_7$.