Spin reorientation transition and coupled spin-lattice dynamics of Sm 0.6 Dy 0.4 FeO 3 .

Autor: Khan AA; Laser and Functional Materials Division, Raja Ramanna Centre for Advanced Technology, Indore-452013, India.; Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India., Ahlawat A; Laser and Functional Materials Division, Raja Ramanna Centre for Advanced Technology, Indore-452013, India., Sharma A; Indian Institute of Technology, Bombay, Mumbai 400076, India., Deshmukh P; Laser and Functional Materials Division, Raja Ramanna Centre for Advanced Technology, Indore-452013, India.; Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India., Singh MN; Synchrotrons Utilization Section, Raja Ramanna Centre for Advanced Technology, Indore 452017, India., Sagdeo A; Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India.; Synchrotrons Utilization Section, Raja Ramanna Centre for Advanced Technology, Indore 452017, India., Sathe V; UGC-DAE Consortium for Scientific Research, Indore Centre, 452017, India., Karnal AK; Laser and Functional Materials Division, Raja Ramanna Centre for Advanced Technology, Indore-452013, India.; Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India., Satapathy S; Laser and Functional Materials Division, Raja Ramanna Centre for Advanced Technology, Indore-452013, India.; Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai-400094, India.
Jazyk: angličtina
Zdroj: Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2020 Jul 08; Vol. 32 (40). Date of Electronic Publication: 2020 Jul 08.
DOI: 10.1088/1361-648X/ab9d4e
Abstrakt: In this work, we have presented a solid-solution of Sm 0.6 Dy 0.4 FeO 3 in the form of nano-particles having spin reorientation transition (SRT) at a temperature interval of 220-260 K. The lattice dynamics of Sm 0.6 Dy 0.4 FeO 3 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 Sm 3+ and Fe 3+ 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 Sm 0.6 Dy 0.4 FeO 3 . 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.
(© 2020 IOP Publishing Ltd.)
Databáze: MEDLINE
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