期刊
PHYSICAL REVIEW B
卷 104, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L020511
关键词
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资金
- Austrian Science Fund (FWF) [P 30269-N36, P 32144-N36]
- dCluster of the Graz University of Technology
- VSC3 of the Vienna University of Technology
- Fondo Ateneo-Sapienza 2017
- VSC4 of the Vienna University of Technology
- Fondo Ateneo-Sapienza 2018
- Fondo Ateneo-Sapienza 2019
In this paper, a new high-Tc hydride superconductor, LaBH8, is computationally predicted to have a Tc of 126 K at a pressure of 50 GPa, making it thermodynamically stable above 100 GPa and dynamically stable down to 40 GPa. LaBH8's unique structure, a ternary sodalite-like hydride, is stabilized by a metallic hydrogen sublattice supported by La-B scaffolding, allowing for a more efficient packing of atoms than in binary sodalite hydrides due to the combination of elements of different sizes.
In the last five years a large number of new high-temperature superconductors have been predicted and experimentally discovered among hydrogen-rich crystals, at pressures, which are way too high to meet any practical application. In this paper, we report the computational prediction of a hydride superconductor, LaBH8, with a T-c of 126 K at a pressure of 50 GPa, thermodynamically stable above 100 GPa, and dynamically stable down to 40 GPa, an unprecedentedly low pressure for high-T-c hydrides. LaBH8 can be seen as a ternary sodalite-like hydride, in which a metallic hydrogen sublattice is stabilized by the chemical pressure exerted by the La-B scaffolding, which achieves a more efficient packing of atoms than in binary sodalite hydrides thanks to the combination of elements with very different sizes. The proposed aufbau principle may be exploited to design high-T-c hydrides that survive at even lower pressure, through a careful choice of the elements.
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