Abstract
Spin-phonon coupling and magnetodielectric effects of $\mathrm{Zn}{\mathrm{Cr}}_{2}{\mathrm{Se}}_{4}$ were investigated by means of infrared (IR) spectroscopy as functions of temperature and magnetic field. $\mathrm{Zn}{\mathrm{Cr}}_{2}{\mathrm{Se}}_{4}$ is dominated by ferro exchange but undergoes antiferro order at ${T}_{N}=21\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. In the ally ordered phase, the low-frequency IR-active phonon splits, indicating strong dynamic anisotropy via exchange interactions. Antiferromagnetic order and concomitantly the phonon splitting are wiped out by external magnetic fields. Hence, $\mathrm{Zn}{\mathrm{Cr}}_{2}{\mathrm{Se}}_{4}$ is a prominent example of a spin-driven Jahn-Teller effect, which can be fully suppressed in external magnetic fields.
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