论文标题
磁敏感性显示的电子相位图
Electronic phase diagram in Te-annealed superconducting FeTe$_{1-x}$Se$_x$ revealed by magnetic susceptibility
论文作者
论文摘要
基于Fe的超导体的掺杂（X） - 温度（t）相图的知识对于理解高过渡温度超导性的机理至关重要。在这里，我们测量了Te灭绝的Fete $ _ {1-X} $ SE $ _X $的磁化易感性的掺杂依赖性。在磁敏感性的温度依赖性中观察到了两个特征温度$ t^*_χ$和$ t^{**}_χ$，在磁化率的温度依赖性中，磁化率降低到t $^{**} _χ$以下，并倾向于随着温度的进一步降低而升高，低于t $^*_χ$。磁敏感性的降低以下t $^{**}_χ$被认为是由于伪造的打开。而磁敏感性的增加以下是t $^*_χ$归因于电子的载体浓度的增加。此外，我们发现大型超导波动可能与BCS-BEC跨界有关。
Knowledge of the doping (x)-temperature (T) phase diagram of Fe-based superconductors is crucial in understanding the mechanism of high transition temperature superconductivity. Here, we measured the Se doping dependence of the magnetic susceptibility for Te-annealed FeTe$_{1-x}$Se$_x$. Two characteristic temperatures $T^*_χ$ and $T^{**}_χ$ were observed in the temperature dependence of magnetic susceptibility, where the magnetic susceptibility decreased below T$^{**}_χ$ and tended to increase with further decreasing temperature below T$^*_χ$. The decrease in magnetic susceptibility below T$^{**}_χ$ is considered to be due to the opening of the pseudogap. Whereas the increase in magnetic susceptibility below T$^*_χ$ is attributed to the increase in the carrier concentration of electrons. Furthermore, we found the large superconducting fluctuation, which may be related to BCS-BEC crossover.
