Das Shipra, Leelashree S, Sahoo Pabitra K, Chandran Karthika, Murugavel P, Santhosh P N
Perovskite Materials Laboratory, Functional Oxides Research Group (FORG), Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
J Phys Condens Matter. 2025 Jul 14;37(28). doi: 10.1088/1361-648X/ade586.
Magnetostructural studies of DyRFeMnO(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 DyRFeMnO(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 DyFeMnOis 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 DyGdFeMnO(25.08 J (kg K)) which is attributed to the strong spin- phonon coupling present in the system.
对DyRFeMnO（R = Dy、Gd和Ho）进行了磁结构研究，以探讨A位和B位阳离子之间的相互作用及其对 Jahn-Teller 畸变、磁各向异性、自旋-声子耦合和磁热性能的影响。发现DyRFeMnO（R = Dy、Gd和Ho）化合物结晶为正交（Pnma）结构。在自旋重取向温度附近，拉曼振动模式的强度、线宽和声子频率出现强烈异常，这表明存在强自旋-声子耦合。虽然所有体系都表现出自旋-声子耦合，但发现Gd取代的DyFeMnO具有最强的自旋-声子耦合，这与八面体畸变程度明显相关。DyGdFeMnO实现了较大的磁熵变（25.08 J/（kg·K）），这归因于体系中存在的强自旋-声子耦合。
