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arXiv 1509.07433cond-mat.mtrl-sci
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5d金属芯能级的压力诱导交叉

Pressure induced crossing of the core-levels in 5d metals

Alexey A. Tal, Mikhail I. Katsnelson, Marcus Ekholm, Johan Jönsson, Leonid Dubrovinsky, Natalia Dubrovinskaia, Igor A. Abrikosov

摘要:

在P~400 GPa [L]下,观察到hcp Os的压致芯电子间相互作用,即芯能级交叉(CLC)跃迁。Dubrovinksy等人,Nature 525,226-229(2015)]。在这项工作中,我们进行了系统的研究,在所有金属的5d系列(Hf,Ta,W,Re,Os,Ir,Pt,Au)的电子结构的第一性原理计算的压力的影响。我们发现CLC是这一系列金属的普遍效应。而在Pt中,它发生在约1500 GPa,压力大大高于Os,在Ir中,它已经发生在80 GPa。此外,我们预测,在Re的CLC转变可能会出现在环境压力。我们分析了CLC跃迁压力在T-Fermi模型中的变化,发现这种效应与稀土元素中原子的坍缩有许多共同的特征。

英文摘要:

Pressure induced interaction between core electrons, the core level crossing (CLC) transition has been observed in hcp Os at P~400 GPa [L. Dubrovinksy, et al., Nature 525, 226-229 (2015)]. In this work, we carry out a systematic study of the influence of pressure on the electronic structure in all metals of the 5d series (Hf,Ta,W,Re,Os,Ir,Pt,Au) using first-principles electronic structure calculations. We have found that CLC is a general effect for this series of metals. While in Pt it occurs at ~1500 GPa, at a pressure substantially higher than in Os, in Ir it occurs already at 80 GPa. Moreover, we predict that in Re the CLC transition may appear at ambient pressure. We analyze the shifts of the CLC transition pressure across the series within the Thomas-Fermi model, and show that the effect has many common features to the atomic collapse in the rare-earth elements.

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