Enhancement of two dimensionality in electron-doped FeSe
In this work,the evolution of superconducting fluctuations in FeSe films with electron doping induced by the ionic liquid gating technique was reported.Paraconductivity analyses reveal that superconducting fluctuations change from two-to three-dimensional with decreasing temperature.Moreover,with electron doping,the temperature range of three-dimensional fluctuations decreases gradually,indicating that the interlayer coupling of FeSe is gradually weakened,and its two dimensionality is improved.The high-Tc state of FeSe after gating shows similar Tc(～40 K)to that of intercalated FeSe-based materials;in addition,both of them exhibit strong two-dimensional characteristics.This suggests that the enhancement in two dimensionality plays a crucial role in improving the superconductivity in FeSe.
FeSe filmsmechanism for superconductivity enhancementdimension of superconducting fluctuationsparaconductivity
万方数据
维普
