论文标题
高-TC的灯笼氢化物状态
High-Tc state of Lanthanum hydrides
论文作者
论文摘要
灯笼液体的高临界温度阶段值得特别注意，因为该阶段显示出最高的观察到的临界温度。我们专注于评估临界温度，同位素系数及其对该阶段的压力依赖性（LAH10化合物的FM3M相）。通过结合两个耦合常数的方法，描述了与光学和声学模式的相互作用，以及两个特征频率与第一原则计算，我们能够分析光氢在这种独特化合物中临界温度振幅中的作用。具体而言，在高压下评估了254 K的临界温度，同位素系数为0.45，结果与实验数据非常吻合。压力进一步增加的临界温度值的特殊降低是由费米表面上的平坦区域的存在以及两间隙结构的出现来解释的，应通过隧道谱图在实验上观察到。
The high critical temperature phase of lanthanum hydrides deserves special attention because this phase displays the highest observed critical temperature. We focus on the evaluation of the critical temperature, isotope coefficient, and their pressure dependence of this phase (Fm3m phase of the LaH10 compound). By combining the method of two coupling constants, describing the interaction with the optical and acoustic modes, and two characteristic frequencies with first-principle calculations we are able to analyze the role of the light hydrogen in the amplitude of the critical temperature in this unique compound. Specifically, the critical temperature of 254 K and the isotope coefficient of 0.45 are evaluated at high pressure, and the results are in good agreement with the experimental data. The peculiar decrease in the value of the critical temperature upon further increase in pressure is explained by the presence of a flat region on the Fermi surface and the appearance of a two-gap structure, which should be experimentally observable by tunneling spectroscopy.
