论文标题
BCS $ d $ - 波的行为在电子掺杂的库层超导体的电动动力响应中
BCS $d$-wave behavior in the THz electrodynamic response of electron-doped cuprate superconductors
论文作者
论文摘要
尽管在过去的几十年中，对库酸盐超导体进行了深入研究，但就其超导性的显微镜起源尚无共识。在这项工作中，我们测量了使用时间域Terahertz（THZ）光谱仪来确定超荧光光谱谱的温度和田间依赖性的略微不足和超过的LA $ _ {2-x} $ _x $ _x $ _x $ _4 $薄膜的低能电动动力响应。我们表明，温度依赖性遵守关系\ textit {n $ _s $} $ \ propto $ $ 1-（t/t_c）^2 $，典型的肮脏限制bcs bcs like $ d $ - wave超导体。此外，发现磁场依赖性遵循sublinear $ \ sqrt {b} $形式，该形式支持基于超导间隙的$ d $ - 波对称性的预测。这些观察结果表明，这些电子掺杂的铜矿中的超导顺序可以用无序的BCS $ d $ - 波形式主义来很好地描述。
Although cuprate superconductors have been intensively studied for the past decades, there is no consensus regarding the microscopic origin of their superconductivity. In this work, we measure the low-energy electrodynamic response of slightly underdoped and overdoped La$_{2-x}$Ce$_x$CuO$_4$ thin films using time-domain terahertz (THz) spectroscopy to determine the temperature and field dependence of the superfluid spectral weight. We show that the temperature dependence obeys the relation \textit{n$_s$} $\propto$ $1-(T/T_c)^2$, typical for dirty limit BCS-like $d$-wave superconductors. Furthermore, the magnetic field dependence was found to follow a sublinear $\sqrt{B}$ form, which supports predictions based on a $d$-wave symmetry for the superconducting gap. These observations imply that the superconducting order in these electron-doped cuprates can be well described in terms of a disordered BCS $d$-wave formalism.
