Spin-Phonon coupling in Y$_2$NiMnO$_6$ double perovskite probed by Raman spectroscopy
Raimundo Bezerra Macedo Filho, Alejandro Pedro Ayala, Carlos William, de Araujo Paschoal
TL;DR
This study investigates spin-phonon interactions in Y$_2$NiMnO$_6$ using Raman spectroscopy across a wide temperature range, revealing phonon softening linked to magnetic interactions and challenging assumptions about ionic radius effects.
Contribution
It provides new insights into spin-phonon coupling mechanisms in double perovskites, showing ionic radius is not the sole factor influencing magnetic interactions.
Findings
Spin-phonon coupling causes phonon softening in Y$_2$NiMnO$_6$.
Temperature-dependent Raman spectra reveal magnetic interaction stabilization.
Ionic radius in Re$_2$NiMnO$_6$ does not solely determine spin-coupling strength.
Abstract
We performed Raman spectroscopy measurements under temperature changes from 10 K up to 850 K to probe the phonon-spin coupling in YNiMnO. The spin-phonon coupling was observed as a softening of the stretching mode, indicating this phonon stabilizes the magnetic interaction. The result indicates the rare earth ionic radius in ReNiMnO double perovskites is not the unique parameter influencing the spin-coupling magnitude.
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