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arXiv 1707.02470cond-mat.supr-con
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112型铁基超导体的准二维行为

Quasi-2D behavior of 112-type iron-based superconductors

D. Sóñora, C. Carballeira, J. J. Ponte, Tao Xie, Huiqian Luo, Shiliang Li, J. Mosqueira

摘要:

测量了最近发现的112族铁基超导体Ca $_{1-x}$ La $_x$ Fe $_{1-y}$ Ni $_y$ As $_2$在超导转变温度(Tc)以上的涨落磁导率和磁化强度。的劳伦斯-Doniach(LD)的方法,以有限的施加磁场的概括方面的分析表明,这些化合物是最各向异性IBS($γ$高达~30),并提供了一个令人信服的证据,准二维行为的掺杂水平附近的最佳的。

英文摘要:

Fluctuation magnetoconductivity and magnetization above the superconducting transition temperature (Tc) are measured on the recently discovered 112 family of iron-based superconductors (IBS), Ca$_{1-x}$La$_x$Fe$_{1-y}$Ni$_y$As$_2$, which presents an extra As-As chain spacer-layer. The analysis in terms of a generalization of the Lawrence-Doniach (LD) approach to finite applied magnetic fields indicates that these compounds are among the most anisotropic IBS ($γ$ up to ~30), and provides a compelling evidence of a quasi-two-dimensional behavior for doping levels near the optimal one.

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