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Description:

The highest superconducting transition temperature in Nb among elemental materials facilitates applications of superconducting junctions. Nonetheless, its surface forms self-organized oxide structures, which hinders the preparation of well-defined interfaces. We investigated the atomic structure of oxygen-induced Nb(1 1 0) surfaces, aiming to define the substrates for such interfaces. The atomic force microscopy and scanning tunneling microscopy measurements visualized two rows of apparently low-lying Nb and three rows of O between Nb chains. An optimized model structure is proposed based on density-functional theory calculations. Analysis of the Bader charge and the density of states clarified how the atoms appear in the microscopies.

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• In Copyright
  

Keyword: Nb(110), AFM, STM, DFT

Date published: 2024-05-08

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 24699969) vol. 109 195417

Funding:

• Japan Society for the Promotion of Science 22H04496
• Japan Society for the Promotion of Science 20H05849
• Japan Society for the Promotion of Science 21K18867
• Japan Society for the Promotion of Science 22H05448
• Japan Society for the Promotion of Science 22H01950
• Japan Science and Technology Agency JPMJFR203J
• Asahi Glass Foundation
• Murata Science Foundation

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1103/physrevb.109.195417

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Updated at: 2024-05-29 08:30:07 +0900

Published on MDR: 2024-05-29 08:30:08 +0900