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arXiv 1601.04542cond-mat.supr-con
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电子掺杂铜氧化物薄膜能隙的非BCS温度依赖性

Non-BCS temperature dependence of energy gap in thin film electron-doped cuprates

R. Szczesniak, A. P. Durajski

摘要:

研究了电子掺杂高温超导体的能隙隙($G$)与温度($T$)的关系。考虑了薄膜形式的以下化合物:$\rm La_{2-x}Ce_xCuO_{4}$(LCCO)、$\rm Pr_{2-x}Ce_xCuO_{4}$(PCCO)和$\rm Nd_{2-x}Ce_xCuO_4$(NCCO)。结果发现,$G\left(T\right)$偏离BCS预测更多,如果铈的浓度采取较低的值。对于最低浓度(在LCCO和NCCO的情况下),函数$G\left(T\right)$不太像BCS曲线,这与残余能斯特区的存在有关。其次,已经指出的是,NCCO超导体变得结构不稳定的最大浓度的铈,这是导致的异常依赖于温度的能隙和宽能斯特区的诱导。

英文摘要:

We investigate the dependence of the energy gap ($G$) on the temperature ($T$) for the electron-doped high-temperature superconductors. The following compounds, in the form of the thin films, have been taken into consideration: $\rm La_{2-x}Ce_xCuO_{4}$ (LCCO), $\rm Pr_{2-x}Ce_xCuO_{4}$ (PCCO), and $\rm Nd_{2-x}Ce_xCuO_4$ (NCCO). It was found that $G\left(T\right)$ deviates from the BCS prediction more, if a concentration of cerium assumes the lower values. For the lowest concentration (in the case of LCCO and NCCO), the function $G\left(T\right)$ is not quite like the BCS curve, which is connected with the existence of the residual Nernst region. Next, it has been pointed out that the NCCO superconductor becomes structurally unstable for the maximum concentration of cerium, which is leading to the anomalous dependence of the energy gap on the temperature and the induction of the wide Nernst region.

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