Spin reorientation transition and coupled spin-lattice dynamics of Sm0.6Dy0.4FeO3

In this work, we have presented a solid-solution of Sm0.6Dy0.4FeO3 in the form of nano-particles having spin reorientation transition (SRT) at a temperature interval of 220-260 K. The lattice dynamics of Sm0.6Dy0.4FeO3 have investigated by temperature-dependent x-ray diffraction and Raman spectrosco...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2020-09, Vol.32 (40)
Main Authors: Khan, Azam Ali, Ahlawat, Anju, Sharma, A, Deshmukh, Pratik, Singh, M N, Sagdeo, Archna, Sathe, Vasant, Karnal, A K, Satapathy, S
Format: Article
Language:English
Subjects:
magneto-elastics coupling
SmFeO3
spin reorientation transition
spin-phonon coupling
synchrotron XRD
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Summary:In this work, we have presented a solid-solution of Sm0.6Dy0.4FeO3 in the form of nano-particles having spin reorientation transition (SRT) at a temperature interval of 220-260 K. The lattice dynamics of Sm0.6Dy0.4FeO3 have investigated by temperature-dependent x-ray diffraction and Raman spectroscopy. A negative thermal expansion at low temperatures has observed, which might be due to the interaction between Sm3+ and Fe3+ sublattice. Anomalous behavior in lattice parameters, octahedral tilt angle, and bond lengths have observed in the vicinity of SRT, which confirms the existence of magneto-elastic coupling in the system. The strong anomaly has observed in linewidth and phonon frequencies of Raman modes around SRT, which may be related to the spin-phonon coupling in Sm0.6Dy0.4FeO3. The contribution of SRT in lattice change and the presence of spin-phonon coupling can help to understand the correlation between the magnetic and structural properties of orthoferrite.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ab9d4e