同时注入电子与离子—电池中的物理问题 | 本周物理学术讲座

报告人：Takasada Shibauchi，University of Tokyo

时间：11月1日（周三）10:00

单位：中科院物理研究所

地点：M楼236

The most important aspect of the iron-based superconductors may be that they open a new landscape in which to study mechanisms of unconventional pairing that lead to high-Tc superconductivity. The high transition temperatures in both cuprates and iron pnictides cannot be explained theoretically by the conventional electron-phonon pairing mechanism, and thus there is almost complete consensus that the superconductivity of both systems has an unconventional origin. Here I will discuss the relationship with competing orders in the phase diagrams of iron-based superconductors. In BaFe2As2-based superconductors, we find several pieces of evidence for the presence of the quantum critical point (QCP) of the antiferromagnetically ordered phase, where several anomalous properties have been observed. However, the ordered phase also involves electronic nematicity, whose impact on the superconductivity is hard to be distinguished from that of magnetism. In contrast, one can tune nonmagnetic nematic QCP in FeSe-based superconductors. The comparisons between phase diagrams of these two systems, the relationship between QCPs and superconductivity will be discussed.