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Metal-to-insulator transition in oxide semimetals by anion doping
Haitao Hong, Huimin Zhang, Shan Lin, Jeffrey A. Dhas, Binod Paudel, Shuai Xu, Shengru Chen, Ting Cui, Yiyan Fan, Dongke Rong, Qiao Jin, Zihua Zhu, Yingge Du, Scott A. Chambers, Chen Ge, Can Wang, Qinghua Zhang, Le Wang, Kui-juan Jin, Shuai Dong, Er-Jia Guo
Interdisciplinary Materials ›› 2024, Vol. 3 ›› Issue (3) : 358-368.
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Metal-to-insulator transition in oxide semimetals by anion doping
Oxide semimetals exhibiting both nontrivial topological characteristics stand as exemplary parent compounds and multiple degrees of freedom, offering a promise for the realization of novel electronic states. In this work, we report the structural and transport phase transition in an oxide semimetal, SrNbO3, achieved through effective anion doping. Notably, the resistivity increased by more than three orders of magnitude at room temperature upon nitrogendoping. The extent of electronic modulation in SrNbO3 is strongly correlated with misfit strain, underscoring its phase instability to both chemical doping and crystallographic symmetry variations. Using first-principles calculations, we discern that elevating the level of nitrogen doping induces an upward shift in the conductive bands of SrNbO3−δNδ. Consequently, a transition from a metallic state to an insulating state becomes apparent as the nitrogen concentration reaches a threshold of 1/3. This investigation shows effective anion engineering in oxide semimetals, offering pathways for manipulating their physical properties.
anion doping / metal-to-insulator transition / oxide semimetal / phase transition
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