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首页> 外文期刊>Physical review >Intrinsic Nature Of Thermally Activated Dynamical Modes In α-u: Nonequilibrium Mode Creationrnby X-ray And Neutron Scattering
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Intrinsic Nature Of Thermally Activated Dynamical Modes In α-u: Nonequilibrium Mode Creationrnby X-ray And Neutron Scattering

机译：α-u中热激活动态模的本征性质：X射线和中子散射产生的非平衡模

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Inelastic x-ray and neutron scattering were used to measure two matching lattice excitations on the [01 ξ] zone boundary in α-uranium. The excitations have the same polarization and reciprocal-space structure, but one has energy consistent with the thermal activation energy of the other, indicating that it creates the mode. The implied mechanism, where a mode is created by an amplitude fluctuation that mirrors the mode itself, is consistent with an intrinsically localized mode (ILM), and this is supported by thermodynamic data. The reciprocal-space structure, however, indicates a mode that is extended along its polarization direction, [010], and yet fully localized along a perpendicular direction, [001]. An enhancement of the thermal but not electrical conductivity with mode activation also suggests that these modes are more mobile than conventional ILMs. The behavior is, however, qualitatively similar to that predicted for ILMs on two-dimensional hexagonal lattices, where in-plane localization has been shown to be extended over more than ten discrete units, and the modes can be highly mobile.
机译：使用非弹性X射线和中子散射来测量α-铀中[01ξ]区域边界上的两个匹配晶格激发。激发具有相同的极化和倒数空间结构，但是一个激发的能量与另一个激发热的能量一致，表明它产生了模态。隐含的机制是由反映模型本身的幅度波动创建的，该机制与本征局部模式（ILM）一致，并且这由热力学数据支持。但是，倒数空间结构表示一种模式，该模式沿其偏振方向[010]延伸，但沿垂直方向[001]完全定位。通过模式激活增强导热性但不增强电导率也表明，这些模式比常规ILM更易移动。但是，该行为在质量上与二维六角形晶格上的ILM所预测的行为相似，在二维六角形晶格中，平面内定位已显示为扩展了十多个离散单元，并且这些模式可以高度移动。

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