'Tubular' Lanthanum Hydride: A New Class of High-Temperature Superconducting Materials
| Autor: | K. S. Grishakov, N. N. Degtyarenko, Evgeny Mazur |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Condensed matter physics Solid-state physics Hydrogen Hydride Phonon chemistry.chemical_element Metallic hydrogen 01 natural sciences Semimetal 010305 fluids & plasmas Condensed Matter::Materials Science chemistry Condensed Matter::Superconductivity 0103 physical sciences Lanthanum Density functional theory 010306 general physics |
| Zdroj: | JETP Letters. 109:410-418 |
| ISSN: | 1090-6487 0021-3640 |
| DOI: | 10.1134/s0021364019060109 |
| Popis: | Quantum calculations within density functional theory have predicted a new structure of lanthanum hydride La2H24 that is dynamically stable up to pressures about 150 GPa. It is a semimetal and has a low symmetry of crystal lattice $$P\bar{1}$$ . An important feature of this structure is the existence of quasimolecular hydrogen chains, which leads to the presence of phonon frequencies of about 420 meV, exceeding the maximum vibration frequency of the metallic hydrogen Fddd phase (ω ~ 360 meV). These properties make it possible to expect a high superconducting transition temperature for lanthanum hydride La2H24. |
| Databáze: | OpenAIRE |
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