تقرير
Computational prediction of samarium hydride at megabar pressure
| العنوان: | Computational prediction of samarium hydride at megabar pressure |
|---|---|
| المؤلفون: | Zhao, Zelong, Chen, Siyu, Monserrat, Bartomeu, Plekhanov, Evgeny, Weber, Cedric |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Superconductivity |
| الوصف: | Samarium hydrides, belonging to the broad class of lanthanide polyhydrides, have yet to be experimentally tested at high pressure. In this study, we use random structure searches to explore multiple possible stoichiometries and propose SmH$_2$ with a layered hexagonal structure in the $P6/mmm$ space group and SmH$_6$ with hydrogen clathrate structures in the Im-3m space group as theoretically stable phases of samarium hydrides at a wide range of pressures centered around $200$ GPa. We further combine the first-principles methods of density functional theory and dynamical mean-field theory to explore many-body correlations in samarium hydrides, reporting electron and phonon dispersions and densities of states, and also evaluate the electron-phonon driven superconductivity to investigate low critical temperatures at $200$ GPa. Comment: 6 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2208.01577 |
| رقم الأكسشن: | edsarx.2208.01577 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |