论文标题
电子掺杂的Sr $ _ {1-x} $ eu $ _ {x} $ cuo $ _ {2+y} $ films的渗透性超导率
Percolative Superconductivity in Electron-Doped Sr$_{1-x}$Eu$_{x}$CuO$_{2+y}$ Films
论文作者
论文摘要
电子掺杂的无限层Sr $ _ {1-x} $ eu $ _ {x} $ cuo $ _ {2+y} $胶片在宽阔的兴奋剂范围内已在SRTIO $ _3 $（001）上使用反应性分子束表皮表现出在SRTIO $ _3 $（001）上的互相准备。单晶样品的平面内传输测量结果显示，圆顶形状的无节性超导相中，以$ x $ $ \ sim $ 0.15，一种费米 - 液体行为，并在低温电阻率中发出了上涨。我们表明，电阻率上升遵循方形 - 根温度依赖性，表明通过三维渗透过程出现超导性。渗透性超导性通过对高温扫描隧道显微镜的超导相和金属相之间的电子相分离来进行光谱的佐证。此外，我们可视化的间隙和根尖氧阴离子，数量迅速增加为$ x> $ 0.12，并阐明了它们对超导性和正常状态电阻率的影响。
Electron-doped infinite-layer Sr$_{1-x}$Eu$_{x}$CuO$_{2+y}$ films over a wide doping range have been prepared epitaxially on SrTiO$_3$(001) using reactive molecular beam epitaxy. In-plane transport measurements of the single crystalline samples reveal a dome-shaped nodeless superconducting phase centered at $x$ $\sim$ 0.15, a Fermi-liquid behavior and pronounced upturn in low temperature resistivity. We show that the resistivity upturn follows square-root temperature dependence, suggesting the emergence of superconductivity via a three-dimensional percolation process. The percolative superconductivity is corroborated spectroscopically by imaging the electronic phase separation between superconducting and metallic phases with low-temperature scanning tunneling microscopy. Furthermore, we visualize interstitial and apical oxygen anions that rapidly increase in number as $x>$ 0.12, and elucidate their impacts on the superconductivity and normal-state resistivity.
