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arXiv 2106.04713cond-mat.mtrl-sci
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多层固相外延anti-ThCr $_2$ Si $_2$型La $_2$ O $_2$ Sb薄膜中Sb方网的高导电性

High electrical conduction of Sb square net in anti-ThCr$_2$Si$_2$ type La$_2$O$_2$Sb thin film grown by multilayer solid-phase epitaxy

Yuki Yamamoto, Hideyuki Kawasoko, Tomoteru Fukumura

摘要:

迄今为止,具有Sb方形网的反ThCr $_2$ Si $_2$型$RE_2$ O $_2$ Sb($RE$ =稀土)显示出绝缘导电性。本文首次报道了采用多层固相外延法合成La $_2$ O $_2$ Sb外延薄膜。从X射线光电子能谱测量中估计Sb的价态约为-2,并且观察到0.17eV的间接带隙。La $_2$ O $_2$ Sb外延薄膜显示出作为窄禁带半导体的出乎意料的高导电性,其在室温下的电阻率比La $_2$ O $_2$ Sb块状多晶的电阻率低约一万倍,这归因于可能由于抑制Sb二聚而增加的载流子迁移率。

英文摘要:

Anti-ThCr$_2$Si$_2$ type $RE_2$O$_2$Sb ($RE$ = rare earth) with Sb square net has shown insulating conduction so far. Here we report the synthesis of La$_2$O$_2$Sb epitaxial thin films for the first time by multilayer solid-phase epitaxy. The valence state of Sb was about -2 evaluated from X-ray photoemission spectroscopy measurement, and the indirect band gap of 0.17 eV was observed. The La$_2$O$_2$Sb epitaxial thin film showed unexpectedly high electrical conduction as a narrow gap semiconductor, whose resistivity at room temperature was approximately ten-thousand-fold lower than that of La$_2$O$_2$Sb bulk polycrystal, attributed to increased carrier mobility probably due to suppressed Sb dimerization.

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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