新发现的Li2PtSi3超导体的结构、弹性和电子性质：过渡金属的影响
Structural, elastic, and electronic properties of newly discovered Li2PtSi3 superconductor: Effect of transition metals
摘要：
采用密度泛函理论（DFT）中的第一性原理计算，采用GGA-PBE交换关联方法，首次对新发现的锂硅化物超导体Li_2 PtSi_3的结构、弹性和电子性质进行了理论预测.所有的理论结果与最近计算的同构Li_2IrSi_3。本研究揭示了用Pt替代过渡金属元素Ir对不同机械、电子和超导性质的影响。自旋-轨道耦合对电子能带结构的影响被发现是微不足道的Li 2 PtSi 3。Li 2 PtSi 3和Li 2 IrSi 3的超导转变温度的差异主要是由于费米能级处的电子态的能量密度的差异而产生的。稍微降低的德拜温度在Li 2 PtSi 3中起次要作用。在本研究中，我们详细讨论了理论结果的含义。
英文摘要：
First-principles calculations within the density functional theory (DFT) with GGA-PBE exchange-correlation scheme have been employed to predict the structural, the elastic and the electronic properties of newly discovered lithium silicide superconductor, Li2PtSi3, for the first time. All the theoretical results are compared with those calculated recently for isostructural Li2IrSi3. The present study sheds light on the effect of replacement of transition metal element Ir with Pt on different mechanical, electronic, and superconducting properties. The effect of spin-orbit coupling on electronic band structure was found to be insignificant for Li2PtSi3. The difference in superconducting transition temperatures of Li2PtSi3 and Li2IrSi3 arises primarily due to the difference in electronic energy density of states at the Fermi level. Somewhat reduced Debye temperature in Li2PtSi3 plays a minor role. We have discussed the implications of the theoretical results in details in this study.
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