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CONDENSED MATTER
“Tubular” lanthanum hydride: a new class of high-temperature superconducting materials
N. N. Degtyarenkoa, K. S. Grishakova, E. A. Mazurab a National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia
b National Research Center Kurchatov Institute, Moscow, Russia
Abstract:
Quantum calculations within density functional theory have predicted a new structure of lanthanum hydride La$_2$H$_{24}$ that is dynamically stable up to pressures about $150$ GPa. It is a semimetal and has a low symmetry of crystal lattice $P\overline{1}$. 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 ($\omega\sim360$ meV). These properties make it possible to expect a high superconducting transition temperature for lanthanum hydride La$_2$H$_{24}$.
Received: 13.12.2018 Revised: 21.01.2019 Accepted: 28.01.2019
Citation:
N. N. Degtyarenko, K. S. Grishakov, E. A. Mazur, ““Tubular” lanthanum hydride: a new class of high-temperature superconducting materials”, Pis'ma v Zh. Èksper. Teoret. Fiz., 109:6 (2019), 413–422; JETP Letters, 109:6 (2019), 410–418
Linking options:
https://www.mathnet.ru/eng/jetpl5858 https://www.mathnet.ru/eng/jetpl/v109/i6/p413
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