论文标题
$ ab〜1ain $ li-mg-b超导体研究
$Ab~initio$ study of Li-Mg-B superconductors
论文作者
论文摘要
LIB是一种类似于MGB $ _2 $超导体的层状化合物，最近通过冷压缩合成并淬灭至环境压力，但尚未测量其超导性能。根据先前的各向同性超导性计算，预计的临界温度（$ t _ {\ rm {c}} $）只有10 $ - $ 15 k。使用各向异性Migdal-Eliashberg形式主义，我们表明$ t _ {\ rm rmm {c rmm {c} n eformant of termions + 32 k。压力和掺杂对化合物超导特性的影响。在搜索相关的超导体时，我们筛选了Li-Mg-B二进制和三元分层材料，并找到了具有$ t _ {\ rm {C}} $接近甚至10 $ 20％的亚稳态阶段。我们对LI-B二元相稳定性的重新审查揭示了在多轴维细胞中易于实现的下压力下合成LIB超导体的可能途径。
LiB, a predicted layered compound analogous to the MgB$_2$ superconductor, has been recently synthesized via cold compression and quenched to ambient pressure, yet its superconducting properties have not been measured. According to prior isotropic superconductivity calculations, the critical temperature ($T_{\rm{c}}$) was expected to be only 10$-$15 K. Using the anisotropic Migdal-Eliashberg formalism, we show that the $T_{\rm{c}}$ may actually exceed 32 K. Our analysis of the contribution from different electronic states helps explain the detrimental effect of pressure and doping on the compound's superconducting properties. In the search for related superconductors, we screened Li-Mg-B binary and ternary layered materials and found metastable phases with $T_{\rm{c}}$ close to or even 10$-$20% above the record 39 K value in MgB$_2$. Our reexamination of the Li-B binary phase stability reveals a possible route to synthesize the LiB superconductor at lower pressures readily achievable in multianvil cells.
