Spin-phonon coupling in HoCr1 − x Fe x O3 (x = 0 and 0.5) compounds

Kotnana, Ganesh and Sathe, Vasant G and J, Suryanarayana (2018) Spin-phonon coupling in HoCr1 − x Fe x O3 (x = 0 and 0.5) compounds. Journal of Raman Spectroscopy, 49 (4). pp. 764-770. ISSN 0377-0486

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Abstract

We report on the temperature dependent Raman scattering studies of polycrystalline HoCr1-xFexO3 (x=0 and 0.5) compounds. No signature of phonon mode related to structural phase transition is evident in the investigated temperature range in both the compounds. The thermal evolution of phonon spectra indicates a deviation of B-3g(3) mode from the expected anharmonic behaviour below magnetic ordering temperature T-N in HoCrO3 compound. This behaviour is attributed to spin-phonon coupling, which is due to the modulation of super exchange integral by lattice vibration. On the other hand, the anomalous behaviour of A(g) mode and its line-width around magnetic ordering in HoCr0.5Fe0.5O3 compound suggest the spin-phonon coupling. Apart from that, a clear deviation of wavenumber pertinent to B-2g(1) mode suggests the possibility to observe ferroelectricity in HoCr0.5Fe0.5O3 compound. We believe that the present results would be helpful in obtaining new materials with multiferroicity near room temperature.

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