M Rosalin, K A Irshad, Boby Joseph, Prachi Telang, Surjeet Singh, D V S Muthu, A K Sood
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引用次数: 0
摘要
热绿核铱酸盐 A2Ir2O7 具有多种结构、电子和磁性能,这些性能受不同交换相互作用的控制,并可通过外部压力进行调节。在这项研究中,我们利用同步加速器 X 射线衍射(高达 ∼ 20 GPa)和拉曼散射测量(高达 ∼ 25 GPa),报告了热绿核系列 (Sm1-xBix)2Ir2O7 (x = 0、0.02 和 0.10)在环境温度下的压力诱导等结构相变。我们的拉曼和 X 射线数据表明,Sm2Ir2O7 在 Pc ∼ 11.2 GPa 时发生了等结构转变,这与热绿核晶格中 IrO6 八面体的重排有关。当 x = 0.02 和 0.10 时,过渡压力分别降至 10.2 和 9 GPa。在所有样品中,与 Ir-O-Ir (A1g 和 Eg)和 Ir-O (T24g)振动相关的三个声子的线宽在 Pc 以下出现异常下降,这是由于电子与声子的相互作用减弱所致。
Iso-structural phase transition in pyrochlore iridates (Sm _{1-x}$Bix)2Ir2O7(x= 0, 0.02, and 0.10): high-pressure Raman and x-ray diffraction studies.
The pyrochlore iridates,A2Ir2O7, show a wide variety of structural, electronic, and magnetic properties controlled by the interplay of different exchange interactions, which can be tuned by external pressure. In this work, we report pressure-induced iso-structural phase transitions at ambient temperature using synchrotron-based x-ray diffraction (up to ∼20 GPa) and Raman-scattering measurements (up to ∼25 GPa) of the pyrochlore series (Sm_{1-x}Bix)2Ir2O7(x= 0, 0.02, and 0.10). Our Raman and x-ray data suggest an iso-structural transition in Sm2Ir2O7atPc∼ 11.2 GPa, associated with the rearrangement of IrO6octahedra in the pyrochlore lattice. The transition pressure decreases to ∼10.2 and 9 GPa forx= 0.02 and 0.10, respectively. For all the samples, the linewidth of three phonons associated with Ir-O-Ir (A1gandEg) and Ir-O (T2g4) vibrations show anomalous decrease up toPc, due to decrease in electron-phonon interaction.
期刊介绍:
Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.