Spin-phonon coupling in ZnCr2Se4
T. Rudolf, Ch. Kant, F. Mayr, J. Hemberger, V. Tsurkan, A. Loidl
TL;DR
This study investigates how magnetic interactions influence lattice vibrations in ZnCr2Se4, revealing a spin-driven Jahn-Teller effect that can be suppressed by magnetic fields, highlighting strong spin-phonon coupling.
Contribution
It provides the first detailed infrared spectroscopic analysis of spin-phonon coupling and magnetodielectric effects in ZnCr2Se4, demonstrating the magnetic field suppression of phonon splitting.
Findings
Phonon splitting occurs below 21 K due to antiferromagnetic order.
External magnetic fields eliminate phonon splitting.
ZnCr2Se4 exhibits a spin-driven Jahn-Teller effect.
Abstract
Spin-phonon coupling and magnetodielectric effects of ZnCr2Se4 were investigated by means of infrared (IR) spectroscopy as a function of temperature and magnetic field. ZnCr2Se4 is dominated by ferromagnetic exchange but undergoes antiferromagnetic order at T = 21 K. In the magnetically ordered phase the low-frequency IR active phonon splits, indicating strong dynamic anisotropy via magnetic exchange interactions. Antiferromagnetic order and concomitantly the phonon splitting is wiped out by external magnetic fields. Hence, ZnCr2Se4 is a prominent example of a spin-driven Jahn-Teller effect which can be fully suppressed in external magnetic fields.
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