Jahn–Teller distortion and magnetocaloric synergy in Dy<sub>0.5</sub>R<sub>0.5</sub>Fe<sub>0.75</sub>Mn<sub>0.25</sub>O<sub>3</sub>
Magnetostructural studies of Dy<sub>0.5</sub>R<sub>0.5</sub>Fe<sub>0.75</sub>Mn<sub>0.25</sub>O<sub>3</sub>(R = Dy, Gd and Ho) are carried out to study the effect of interaction between the A-site and B-site cations and how they affect the Jahn-Teller distortion, magnetic anisotropy, spin-phonon coupling and magnetocaloric properties. The Dy<sub>0.5</sub>R<sub>0.5</sub>Fe<sub>0.75</sub>Mn<sub>0.25</sub>O<sub>3</sub>(R = Dy, Gd and Ho) compounds are found to be crystallized in the orthorhombic (Pnma) structure. Around the spin reorientation temperature, a strong anomaly is observed in the intensity, line width and phonon frequency of Raman vibrational modes which indicate the presence of strong spin-phonon coupling. While all the systems exhibit spin-phonon coupling, Gd-substituted DyFe<sub>0.75</sub>Mn<sub>0.25</sub>O<sub>3</sub>is found to have the strongest spin-phonon coupling and this is distinctly related to the extent of octahedral distortion. A large magnetic entropy change is achieved in Dy<sub>0.5</sub>Gd<sub>0.5</sub>Fe<sub>0.75</sub>Mn<sub>0.25</sub>O<sub>3</sub>(25.08 J (kg K)<sup>-1</sup>) which is attributed to the strong spin- phonon coupling present in the system.
Authors
- S. Leelashree
- P. Murugavel (ORCID: https://orcid.org/0000-0002-4074-9118)
- Shipra Das (ORCID: https://orcid.org/0009-0003-8268-3393)
- Patitapaban Sahoo
- P. N. Santhosh
- Karthika Chandran (ORCID: https://orcid.org/0000-0002-6271-7571)
Institutions
- Haldia Institute of Technology (IN)
- Indian Institute of Technology Madras (IN)
Publication Details
- Journal
- Journal of Physics Condensed Matter
- Published
- 2025-06-17
- DOI
- https://doi.org/10.1088/1361-648x/ade586
- Citations
- 1
- Primary Topic
- Magnetic and transport properties of perovskites and related materials
- Type
- article
- Field-Weighted Citation Impact
- 0.43