AI 中文总结
本研究合成不同Sm掺杂的铜钌双钙钛矿，发现晶格畸变与Sm磁性共同作用可削弱磁性阻挫，为调控该类材料的磁性提供了新途径。
AI 中文摘要
本研究通过固相反应法合成了基于铜钌酸盐的双钙钛矿氧化物La$_{2-x}$Sm$_x$CuRuO$_6$（x = 0, 1, 2），并研究其结构、磁性和电子性质。X射线衍射分析显示，所有化合物均为单斜晶系，结构畸变程度随阳离子从La$^{3+}$到更小尺寸的Sm$^{3+}$变化而增大。电阻率研究表明，所有化合物均表现为绝缘行为，低温下由变程跳跃主导，原因是存在反位无序。交流磁化率和热容测量结果显示，含Sm化合物的阻挫受到抑制，影响了磁性行为。我们的第一性原理计算表明，晶格畸变与Sm磁性的共同作用在削弱磁性阻挫方面发挥关键作用，从而解释了实验观测结果。这些发现揭示了铜钌双钙钛矿中晶体结构与磁性的复杂相互作用，为通过稀土离子取代调控磁性性质开辟了途径。
英文摘要
In this study, we investigate structural, magnetic, and electronic properties of the copper-ruthenate based oxide double perovskite La$_{2-x}$Sm$_x$CuRuO$_6$ (x = 0, 1, 2), synthesized through the solid-state reaction method. X-ray diffraction analysis reveals that all compounds crystallize in a monoclinic symmetry, with varying degree of structural distortion that increases in moving from La$^{3+}$ to smaller size cation Sm$^{3+}$. Electrical resistivity studies indicate insulating behaviour in all compounds, with variable-range-hopping domination at low temperatures, due to presence of anti-site disorder. AC susceptibility and heat capacity measurements suggest suppression of frustration in Sm-bearing compounds, affecting the magnetic behavior. Our first-principles calculations suggest that the combined effects of lattice distortion and Sm magnetism play a crucial role in weakening magnetic frustration, thereby rationalizing the experimental observations. These findings shed light on the complex interplay of crystal structure and magnetism in Cu-Ru double perovskites, and open up an avenue for tuning of magnetic properties through rare-earth-ion substitution.
Comments21 pages, 16 figures; Accepted for Publication in PRB, in production
