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烟 iridates (Sm_{1-x}$Bi) 2Ir2O7(x= 0, 0.02,和0.10中的同位结构相变:高压拉曼和X射线衍射研究
M Rosalin1, K A Irshad2, Boby Joseph2
1Department of Physics, Indian Institute of Science, Bangalore 560012, India.
概括
压力诱导火 iridates (Sm_{1-x}Bi_x)_2Ir_2O_7.2 的结构变化. 通过X射线衍射和拉曼散射观察到的这些转变与改变的电子声子相互作用和IrO_6八面体重新排列有关.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
- 固态化学 固态化学
背景情况:
- 热 iridates (A_2Ir_2O_7) 呈现出由磁相互作用影响的多样性质.
- 这些特性可以通过外部压力调节,使它们成为新型电子设备的候选者.
- 了解压力诱导的转换对于控制它们的功能至关重要.
研究的目的:
- 为了研究 (Sm_{1-x}Bi_x)_2Ir_2O_7火系列中的压力诱导的异构相过渡.
- 为了确定Bi替代对过渡压力的影响.
- 探索这些过渡和电子 - 声子相互作用之间的关系.
主要方法:
- 基于同步射线的X射线衍射高达~20 GPa.
- 拉曼散射测量最高可达25GPa.
- 对声子线宽度的分析,以探测电子-声子合.
主要成果:
- 在Sm_2Ir_2O_7中观察到~11.2GPa的异构相过渡,归因于IrO_6八面体的重新排列.
- 过渡压力随着Bi替代的增加而降低 (x=0.02和0.10).
- 在传声线宽度到过渡压力的异常下降表明电子-传声互动减少.
结论:
- 压力可以诱导火 iridates中的异构相变,可通过化学替代进行调整.
- 这些转变与格子重新排列和电子-声波合的修改有关.
- 这些发现为控制 iridates 的电子和磁性特性提供了洞察力.
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