Abstract
The combination of high-frequency electron magnetic resonance (EMR) and magnetization measurements enables us to evaluate the exchange interactions in high-field phases of polycrystalline samples of the chromium spinel oxide HgCr${}_{2}$O${}_{4}$. The evaluation indicates that the lattice distortion in this compound largely modulates the exchange interactions between the Cr${}^{3+}$ spins to stabilize its distinct plateau with one-half of the saturation magnetization. Furthermore, we show that a release of the lattice distortion occurs in very high magnetic fields. Our result suggests that the spin-lattice coupling, which causes the large changes in the exchange interactions, plays a crucial role in giving rise to the peculiar magnetization process of HgCr${}_{2}$O${}_{4}$.
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