Scholarlink

<p>With the rise of high entropy oxides, compositional disorder has emerged as a powerful tuning parameter for oxide-based functional properties, prompting the study of its influence on long-range magnetic ordering in double perovskite systems. In this work, we consider the <i>R</i><i>E</i><sub>2</sub>NiMnO<sub>6</sub> (<i>R</i><i>E</i> : rare-earth) family and investigate single-crystalline films of (La<sub>0.4</sub>Nd<sub>0.4</sub>Sm<sub>0.4</sub>Gd<sub>0.4</sub>Y<sub>0.4</sub>)NiMnO<sub>6</sub>. Despite configurational disorder and high cationic size variance at the <i>R</i><i>E-</i>site, the material exhibits robust ferromagnetic ordering with a Curie temperature (<i>T</i><sub>c</sub>) of approximately 150 K, consistent with expectations based on the average ionic radii of the <i>R</i><i>E</i>-sites in bulk <i>R</i><i>E</i><sub>2</sub>NiMnO<sub>6</sub> family. Below <i>T</i><sub>c</sub>, Raman spectroscopy reveals deviations from anharmonic behavior, where the phonon renormalization aligns with a mean-field approximation of spin-spin correlation. At lower temperature, magnetic <i>R</i><i>E</i> ions contribute to the magnetic behavior, and the system displays a reentrant spin-glass-like behavior. This study demonstrates that while a mean-field approach viably captures the long-range transition temperature, microscopic magnetic interactions are essential for understanding the low-temperature phase.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mean field magnetism and spin frustration in a double perovskite oxide with compositional complexity

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月24日

查看全文
  • Nandana Bhattacharya,
  • Ravi Kiran Dokala,
  • Sourav Chowdhury,
  • Suresh Chandra Joshi,
  • Subha Dey,
  • Jayjit Kumar Dey,
  • Subhajit Nandy,
  • Daniel Pérez-Salinas,
  • Manuel Valvidares,
  • Moritz Hoesch,
  • Roland Mathieu,
  • Srimanta Middey

摘要

With the rise of high entropy oxides, compositional disorder has emerged as a powerful tuning parameter for oxide-based functional properties, prompting the study of its influence on long-range magnetic ordering in double perovskite systems. In this work, we consider the RE2NiMnO6 (RE : rare-earth) family and investigate single-crystalline films of (La0.4Nd0.4Sm0.4Gd0.4Y0.4)NiMnO6. Despite configurational disorder and high cationic size variance at the RE-site, the material exhibits robust ferromagnetic ordering with a Curie temperature (Tc) of approximately 150 K, consistent with expectations based on the average ionic radii of the RE-sites in bulk RE2NiMnO6 family. Below Tc, Raman spectroscopy reveals deviations from anharmonic behavior, where the phonon renormalization aligns with a mean-field approximation of spin-spin correlation. At lower temperature, magnetic RE ions contribute to the magnetic behavior, and the system displays a reentrant spin-glass-like behavior. This study demonstrates that while a mean-field approach viably captures the long-range transition temperature, microscopic magnetic interactions are essential for understanding the low-temperature phase.