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Published on: March 24, 2019
Spin reorientation transition and coupled spin-lattice dynamics of Sm0.6Dy0.4FeO3
Azam Ali Khan1,2, Anju Ahlawat1, A Sharma3
1Laser and Functional Materials Division, Raja Ramanna Centre for Advanced Technology, Indore-452013, India.
Abstract:
In this work, we have presented a solid-solution of Sm0.6Dy0.4FeO3in the form of nano-particles having spin reorientation transition (SRT) at a temperature interval of 220-260 K. The lattice dynamics of Sm0.6Dy0.4FeO3have 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.
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