FeSe中压力诱导的高Tc超导相：负离子高度与Tc的关系
Pressure-induced high-Tc superconducting phase in FeSe: correlation between anion height and Tc
摘要：
在这项研究中，我们进行了高压电阻率测量的多晶FeSe的压力范围为1-16.0 GPa，温度为4-300 K。从零电阻率温度的Tc的精确评估显示，Tc显示出轻微扭曲的圆顶形曲线，最大Tc（30 K）在6 GPa，这是低于以前报道的Tc值（~37 K）。随着压力的施加，电阻率的温度依赖性以上Tc的变化显着的线性依赖性，一个非费米液体的“高Tc”的阶段出现在3 GPa以上。我们发现Tc和Se高度之间存在显著的相关性：Se高度越低，Tc越增强。此外，这种关系也广泛适用于其他铁磷属元素化物，强烈表明高温超导只能出现在最佳阴离子高度（~1.38A）附近。在此基础上，我们认为，阴离子高度应被认为是含各种阴离子的铁基超导体的Tc的关键决定因素。
英文摘要：
In this study, we performed high-pressure electrical resistivity measurements of polycrystalline FeSe in the pressure range of 1-16.0 GPa at temperatures of 4-300 K. A precise evaluation of Tc from zero-resistivity temperatures revealed that Tc shows a slightly distorted dome-shaped curve, with maximum Tc (30 K) at 6 GPa, which is lower than a previously reported Tc value (~37 K). With the application of pressure, the temperature dependence of resistivity above Tc changes dramatically to a linear dependence; a non-Fermi-liquid-like "high-Tc" phase appears above 3 GPa. We found a striking correlation between Tc and the Se height: the lower the Se height, the more enhanced is Tc. Moreover, this relation is broadly applicable to other iron pnictides, strongly indicating that high-temperature superconductivity can appear only around the optimum anion height (~1.38A). On the basis of these results, we suggest that the anion height should be considered as a key determining factor of Tc of iron-based superconductors containing various anions.
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