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Updated: Sep 19, 2025

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Jahn-Teller distortion and magnetocaloric synergy in Dy0.5R0.5Fe0.75Mn0.25O3
Shipra Das1,2, S Leelashree2, Pabitra K Sahoo2
1Perovskite Materials Laboratory, Functional Oxides Research Group (FORG), Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
Abstract:
Magnetostructural studies of Dy0.5R0.5Fe0.75Mn0.25O3(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 Dy0.5R0.5Fe0.75Mn0.25O3(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 DyFe0.75Mn0.25O3is 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 Dy0.5Gd0.5Fe0.75Mn0.25O3(25.08 J (kg K)-1) which is attributed to the strong spin- phonon coupling present in the system.
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