Mean field magnetism and spin frustration in a double perovskite oxide with compositional complexity
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Bhattacharya, Nandana Dokala, Ravi Kiran Chowdhury, Sourav Joshi, Suresh Chandra Dey, Subha Dey, Jayjit Kumar Nandy, Subhajit Salinas, Daniel Perez Valvidares, Manuel Hoesch, Moritz Mathieu, Roland Middey, Srimanta |
| author_facet | Bhattacharya, Nandana Dokala, Ravi Kiran Chowdhury, Sourav Joshi, Suresh Chandra Dey, Subha Dey, Jayjit Kumar Nandy, Subhajit Salinas, Daniel Perez Valvidares, Manuel Hoesch, Moritz Mathieu, Roland Middey, Srimanta |
| contents | The rise of high-entropy oxides as a major functional materials design principle in recent years has prompted us to investigate how compositional disorder affects long-range magnetic ordering in double perovskite oxides. Since ferromagnetic insulators are emerging as an important platform for lossless spintronics, we consider the $RE_2$NiMnO$_6$ ($RE$ : rare-earth) family and investigate single-crystalline films of (La$_{0.4}$Nd$_{0.4}$Sm$_{0.4}$Gd$_{0.4}$Y$_{0.4}$)NiMnO$_{6}$ grown on SrTiO$_3$ (001) substrates in this work. Despite configurational disorder and high cationic size variance at the $RE$ site, the material exhibits robust ferromagnetic ordering with a Curie temperature ($T_\mathrm{c}$) of approximately 150 K. This $T_\mathrm{c}$ is consistent with the expectation based on consideration of the average ionic radii of the rare-earth ($RE$) sites in the bulk $RE_2$NiMnO$_6$. Below $T_\mathrm{c}$, Raman spectroscopy measurement finds a deviation from anharmonic behavior, where the phonon renormalization aligns with a mean-field approximation of spin-spin correlation. At lower temperature, magnetic $RE$ ions also contributed to the magnetic behavior and the system displays a reentrant spin-glass-like behavior. This study demonstrates that while a mean-field approach serves as a viable starting point for predicting the long-range transition temperature, microscopic details of the complex magnetic interactions are essential for understanding the low-temperature phase. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_02485 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mean field magnetism and spin frustration in a double perovskite oxide with compositional complexity Bhattacharya, Nandana Dokala, Ravi Kiran Chowdhury, Sourav Joshi, Suresh Chandra Dey, Subha Dey, Jayjit Kumar Nandy, Subhajit Salinas, Daniel Perez Valvidares, Manuel Hoesch, Moritz Mathieu, Roland Middey, Srimanta Materials Science Strongly Correlated Electrons The rise of high-entropy oxides as a major functional materials design principle in recent years has prompted us to investigate how compositional disorder affects long-range magnetic ordering in double perovskite oxides. Since ferromagnetic insulators are emerging as an important platform for lossless spintronics, we consider the $RE_2$NiMnO$_6$ ($RE$ : rare-earth) family and investigate single-crystalline films of (La$_{0.4}$Nd$_{0.4}$Sm$_{0.4}$Gd$_{0.4}$Y$_{0.4}$)NiMnO$_{6}$ grown on SrTiO$_3$ (001) substrates in this work. Despite configurational disorder and high cationic size variance at the $RE$ site, the material exhibits robust ferromagnetic ordering with a Curie temperature ($T_\mathrm{c}$) of approximately 150 K. This $T_\mathrm{c}$ is consistent with the expectation based on consideration of the average ionic radii of the rare-earth ($RE$) sites in the bulk $RE_2$NiMnO$_6$. Below $T_\mathrm{c}$, Raman spectroscopy measurement finds a deviation from anharmonic behavior, where the phonon renormalization aligns with a mean-field approximation of spin-spin correlation. At lower temperature, magnetic $RE$ ions also contributed to the magnetic behavior and the system displays a reentrant spin-glass-like behavior. This study demonstrates that while a mean-field approach serves as a viable starting point for predicting the long-range transition temperature, microscopic details of the complex magnetic interactions are essential for understanding the low-temperature phase. |
| title | Mean field magnetism and spin frustration in a double perovskite oxide with compositional complexity |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2511.02485 |