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arXiv 2005.05468cond-mat.mtrl-sci
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自旋轨道相互作用对液态铀热力学性质的影响

Effect of the spin-orbit interaction on thermodynamic properties of liquid uranium

D. V. Minakov, M. A. Paramonov, P. R. Levashov

摘要:

本文首次采用量子分子动力学方法计算了考虑自旋轨道耦合的固态和液态铀的零压等压线。我们证明了自旋-轨道相互作用的引入导致铀的更高程度的热膨胀,特别是在液相中。价电子的相对论效应,特别是5 f带的自旋轨道分裂的充分会计,是大量的熔融铀在熔化温度下的实验密度的再现。分析了高温高压下自旋轨道相互作用对热力学性质的影响。

英文摘要:

We present the first quantum molecular dynamics calculation of zero-pressure isobar of solid and liquid uranium that account for spin-orbit coupling. We demonstrate that inclusion of spin-orbit interaction leads to higher degree of the thermal expansion of uranium, especially in the liquid phase. Full accounting of relativistic effects for valence electrons, particularly spin-orbital splitting of the 5f band, is substantial for the reproduction of the experimental density of molten uranium at the melting temperature. Influence of the spin-orbit interaction on the thermodynamic properties at high temperatures and pressures is also analyzed.

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