与碱土金属氧化物共烧结的anti-ThCr $_2$ Si $_2$ -型La $_2$ O $_2$ Bi中空穴迁移率的增加
Increased hole mobility in anti-ThCr$_2$Si$_2$-type La$_2$O$_2$Bi co-sintered with alkaline earth metal oxides for oxygen intercalation and hole carrier doping
摘要：
具有Bi正方形网的金属反ThCr $_2$ Si $_2$型$RE_2$ O $_2$ Bi（$RE$ =稀土）显示出超导性，而绝缘La $_2$ O $_2$ Bi通过氧嵌入扩展c轴长度而显示出高空穴迁移率。在这项研究中，碱土金属氧化物（CaO，SrO和BaO）与La $_2$ O $_2$ Bi共烧结。在La $_2$ O $_2$ Bi中，CaO和BaO充当氧嵌入剂，而不掺入Ca和Ba。另一方面，SrO不仅作为氧嵌入剂，而且通过在La $_2$ O $_2$ Bi中用La取代Sr而作为空穴掺杂剂。氧嵌入和空穴掺杂导致c轴长度的扩展，有助于改善导电性。此外，在La $_2$ O $_2$ Bi中，空穴迁移率提高到150 cm $^2$ V $^{-1}$ s $^{-1}$，这几乎是先前研究中迁移率的两倍。
英文摘要：
Metallic anti-ThCr$_2$Si$_2$-type $RE_2$O$_2$Bi ($RE$ = rare earth) with Bi square nets show superconductivity while insulating La$_2$O$_2$Bi shows high hole mobility, by expanding the c-axis length through oxygen intercalation. In this study, alkaline earth metal oxides (CaO, SrO, and BaO) were co-sintered with La$_2$O$_2$Bi. CaO and BaO served as oxygen intercalants without incorporation of Ca and Ba in La$_2$O$_2$Bi. On the other hand, SrO served as not only oxygen intercalant but also hole dopant via Sr substitution with La in La$_2$O$_2$Bi. The oxygen intercalation and hole doping resulted in expansion of the c-axis length, contributing to improved electrical conduction. In addition, the hole mobility was enhanced up to 150 cm$^2$V$^{-1}$s$^{-1}$ in La$_2$O$_2$Bi, which almost doubles the mobility in previous study.
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