Magnetocaloric effect and Griffiths phase analysis in a nanocrystalline Ho2NiMnO6 and Ho2CoMnO6 double perovskite

Rare-earth double perovskite oxides have intriguing magnetocaloric properties at cryogenic temperatures. In this study, Ho2NiMnO6 and Ho2CoMnO6 were synthesized using the sol-gel method, which crystallized in a monoclinic structure in the P2(1)/n space group. The magnetic phase transition was observed at 81.2 K for Ho2NiMnO6 and 73.5 K for Ho2CoMnO6. The presence of a paramagnetic matrix and short-range ferromagnetic clusters causes magnetic disorder in these double perovskites, resulting in Griffiths phase formation. The Arrott plot confirms that compounds undergo second-order phase transition. At an applied magnetic field of 5 T, the maximum magnetic entropy change (-Delta S) for the studied compounds is 1.7 and 2.2 J kg(-1) K-1, respectively. The transition metals Ni and Co in a double perovskite cause lattice distortion in the structural parameters and oxidation states of manganese (Mn3+/Mn4+), which changes the magnetic and magnetocaloric properties. The quantitative approach provides a systematic study of magnetocaloric properties of the rare earth double perovskite compounds with ferromagnetic 3d transition elements.

Automated summary

Rare-earth double perovskite oxides exhibit interesting magnetocaloric properties at low temperatures. Ho2NiMnO6 and Ho2CoMnO6 were synthesized using the sol-gel method and their crystalline structures were determined to be monoclinic in the P2(1)/n space group. Magnetic phase transitions were observed at 81.2 K for Ho2NiMnO6 and 73.5 K for Ho2CoMnO6. The presence of a paramagnetic matrix and short-range ferromagnetic clusters causes magnetic disorder and Griffiths phase formation in these double perovskites. The compounds undergo a second-order phase transition, as confirmed by the Arrott plot. The maximum magnetic entropy change (-Delta S) for these compounds at an applied magnetic field of 5 T is 1.7 and 2.2 J kg(-1) K-1, respectively. The presence of transition metals (Ni and Co) in the double perovskite structure leads to lattice distortion and changes in the oxidation states of manganese (Mn3+/Mn4+), thereby affecting the magnetic and magnetocaloric properties. This quantitative study provides a systematic understanding of the magnetocaloric properties of rare-earth double perovskite compounds with ferromagnetic 3d transition elements.