Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S20: Advanced Characterization and Theory
8:00 AM–10:36 AM,
Thursday, March 7, 2024
Room: M101ABC
Sponsoring
Unit:
DCMP
Chair: Zac Ward
Abstract: S20.00007 : Ionization-sensitive atomic force microscopy for the oxide surface structure of Nb(110)*
9:12 AM–9:24 AM
Presenter:
Yuuki Yasui
(The University of Tokyo)
Authors:
Yuuki Yasui
(The University of Tokyo)
Katsuyuki Matsunaga
(Nagoya University)
Yoshiaki Sugimoto
(The University of Tokyo)
Scanning tunneling microscopy (STM) measurements for the oxygen-induced NbO surfaces on Nb(110) single crystals reproduced the previous reports [2]; a quasi-periodic structure of topmost atoms, referred to as the Nb* chain structure, was confirmed. Furthermore, AFM is capable of detecting O atoms and possibly low-lying Nb atoms, and it revealed that previously proposed models may not be sufficient to fully explain the present observations. We propose a new structure model based on the density functional theory calculations with further analysis of the density of states as well as the Bader charge.
[1] A. B. Odobesko et al., Phys. Rev. B 99, 25335 (2016).
[2] I. Arfaoui et al., Phys. Rev. B 65, 115413 (2002).
*Grant-in-Aid JSPS KAKENHI Grant Nos. 22H04496, 20H05849, 21K18867, 22H05448 and 22H01950.JST FOREST Program Grant No. JPMJFR203J.
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