Spin-driven Phonon Splitting in Bond-frustrated ZnCr2S4
J. Hemberger, T. Rudolf, H. -A. Krug von Nidda, F. Mayr, A. Pimenov, V. Tsurkan, A. Loidl
Abstract
Utilizing magnetic susceptibility, specific heat, thermal expansion and IR spectroscopy we provide experimental evidence that the two subsequent antiferromagnetic transitions in ZnCr2S4 at TN1 = 15 K and TN2= 8 K are accompanied by significant thermal and phonon anomalies. The anomaly at TN2 reveals a strong temperature hysteresis typical for a first-order transformation. Due to strong spin-phonon coupling both magnetic phase transitions induce a splitting of phonon modes, where at TN1 the high-frequency and at TN2 the low-frequency modes split. The anomalies and phonon splitting observed at TN2 are strongly suppressed by magnetic field. Regarding the small positive Curie-Weiss temperature Theta= 8 K, we argue that this scenario of two different magnetic phases with concomitant different magneto-elastic couplings results from the strong competition of ferromagnetic and antiferromagnetic exchange of equal strength.
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