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arXiv 2102.11227cond-mat.supr-con
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LaBH $_{8}$:第一个高温$_{c}$低压超氢化物

LaBH$_{8}$: the first high-T$_{c}$ low-pressure superhydride

Simone Di Cataldo, Christoph Heil, Wolfgang von der Linden, Lilia Boeri

摘要:

在过去的五年里,大量新的高温超导体已经被预测和实验发现,在富氢晶体中,压力太高,无法满足任何实际应用。在这项工作中,我们报告的氢化物超导体,LaBH $_{8}$,与T $_{c}$的126 K的压力为50 GPa的计算预测,在100 GPa以上的热力学稳定,并动态稳定下降到40 GPa,一个前所未有的低压力的高T $_{c}$超导。LaBH $_{8}$可以看作是一种三元类钠长石氢化物,其中金属氢亚晶格通过客体元素施加的化学压力而稳定。LaBH $_{8}$中两种不同原子尺寸的元素的组合实现了比二元方钠石中更有效的原子堆积。可以利用元件的适当选择来进一步将稳定压力降低到环境条件。

英文摘要:

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 work, we report the computational prediction of a hydride superconductor, LaBH$_{8}$, 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. LaBH$_{8}$ can be seen as a ternary sodalite-like hydride, in which a metallic hydrogen sublattice is stabilized by the chemical pressure exerted by the guest elements. The combination of two elements with different atomic sizes in LaBH$_{8}$ realizes a more efficient packing of atoms than in binary sodalite hydrides. A suitable choice of elements may be exploited to further reduce the stabilization pressure to ambient conditions.

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