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arXiv 1609.03151cond-mat.supr-con
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$_x$ Fe $_{2-y}$-Se $_2$超导单晶显微结构的直接观察

Direct Observation of Microstructures on Superconducting Single Crystals of K$_x$Fe$_{2-y}$Se$_2$

Masashi Tanaka, Hiroyuki Takeya, Yoshihiko Takano

摘要:

钾插层FeSe已被报道为超导转变温度($T_{\rm c}$ 's)为30-48 K的超导体。然而,目前还没有明确的答案,以确定之间的关系,表面形貌,组成比例和其晶体结构。这份报告直接揭示了这三个特性之间的对应关系,在单晶体与$T_{\rm c}$开始约44 K,使用微取样技术。晶体表面上的岛状部分清楚地具有具有完全FeSe层的K $_x$ Fe $_2$ Se $_2$结构,其与K $_2$ Fe $_4$ Se $_5$相结合形成。这导致出现44 K的$T_{\rm c}$起始。

英文摘要:

Potassium intercalated FeSe has been reported as a superconductor with superconducting transition temperatures ($T_{\rm c}$'s) of 30-48 K. However, there is no clear answer to identify the relationship between the surface morphology, compositional ratio and its crystal structure. This report directly reveals the correspondence among these three characteristics in single crystals with a $T_{\rm c}$ onset of around 44 K using a micro-sampling technique. Island-like parts on the surface of the crystals clearly have the K$_x$Fe$_2$Se$_2$ structure with perfect FeSe layers, which is formed in conjunction with the K$_2$Fe$_4$Se$_5$ phase. This results in the appearance of the $T_{\rm c}$ onset of 44 K.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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