Year: 2016
Type: article
Abstract: A pressure-induced interaction between core electrons, the core-level crossing (CLC) transition, has been observed in hcp Os at $P\ensuremath{\approx}400\phantom{\rule{0.28em}{0ex}}\mathrm{GPa}$ [L. Dubrovinsky et al., Nature (London) 525, 226 (2015)]. By carrying out a systematic theoretical study for all metals of the $5d$ series (Hf, Ta, W, Re, Os, Ir, Pt, Au) we have found that the CLC transition is a general effect for this series of metals. While in Pt it occurs at $\ensuremath{\approx}1500\phantom{\rule{0.28em}{0ex}}\mathrm{GPa}$, 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 take place already at ambient pressure. We explain the effect of the CLC and analyze the shift of the transition pressure across the series within the Thomas-Fermi model. In particular, we show that the effect has many common features with the atomic collapse in rare-earth elements.
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: bronze
Funders: Swedish e-Science Research Centre, Deutsche Forschungsgemeinschaft, Stiftelsen för Strategisk Forskning, National Science Council, Bundesministerium für Bildung und Forschung, Ministry of Education and Science of the Russian Federation, Linköpings Universitet, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Deutsches Elektronen-Synchrotron, National Supercomputer Centre, Linköpings Universitet
Awards: G120837027, G1445550691, G1696766764, G1734949310, Materials at extreme conditions: discovering fundamental relationships to accelerate knowledge-based design, G193668846, G2156986825, G2611480747, G3312411, G4673583169, G6038076527, G6038278054, G6862880060, G7546053117, G7796589417, G8122836061, G821004061, G8902932485
OpenAlex ID: W2270613941