Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped BaFe2As2
Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped BaFe2As2
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DOI：
10.1016/j.ssc.2009.10.001
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发表时间：
2009-12-01
影响因子：
2.1
通讯作者：
Hosono, Hideo
中科院分区：
文献类型：
--
作者：
Katase, Takayoshi;Hiramatsu, Hidenori;Hosono, Hideo
最近报道了铁基超导体如掺钴 SrFe2As2 (SrFe2As2:CO) 的外延生长，但其性能对于器件应用来说仍然不足，因为它们具有粗糙的表面，并且会在环境大气中与水蒸气发生反应而分解。本文报告称，在 700 摄氏度下生长的 Co 掺杂 BaFe2As2 外延薄膜显示出类似于 20 K 的起始超导转变温度。该转变比在 SrFe2As2:Co 薄膜上观察到的转变更为尖锐，这可能源于其结晶度的提高。这些薄膜还具有原子级平坦的表面和阶梯式平台结构，并表现出对抗水蒸气的化学稳定性。 (C) 2009 Elsevier Ltd. 保留所有权利。
The epitaxial growth of Fe-based superconductors such as Co-doped SrFe2As2 (SrFe2As2:CO) was reported recently, but has still insufficient properties for a device application because they have rough surfaces and are decomposed by reactions with water vapor in an ambient atmosphere. This paper reports that epitaxial Films of Co-doped BaFe2As2 grown at 700 degrees C show the onset superconducting transition temperature of similar to 20 K. The transition is sharper than those observed on the SrFe2As2:Co films, which would originate from their improved crystallinity. These films also have atomically-flat surfaces with step-and-terrace structures and exhibit chemical stability against exposure to water vapor. (C) 2009 Elsevier Ltd. All rights reserved.