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root 2 x root 2R45 degrees surface reconstruction and electronic structure of BaSnO3 film

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Title
root 2 x root 2R45 degrees surface reconstruction and electronic structure of BaSnO3 film
Author(s)
Shoresh Soltani; Sungyun Hong; Bongju Kim; Donghan Kim; Jong Keun Jung; Byungmin Sohn; Tae Won Noh; Kookrin Char; Changyoung Kim
Subject
BAND-GAP, ; TRANSPARENT, ; MOBILITY
Publication Date
2020-05
Journal
PHYSICAL REVIEW MATERIALS, v.4, no.5, pp.055003
Publisher
AMER PHYSICAL SOC
Abstract
©2020 American Physical Society. We studied the surface and electronic structures of barium stannate (BaSnO3) thin films by low-energy electron diffraction (LEED) and angle-resolved photoemission spectroscopy (ARPES) techniques. BaSnO3/Ba0.96La0.04SnO3/SrTiO3 (10 nm/100 nm/0.5 mm) samples were grown using the pulsed-laser deposition (PLD) method and were ex situ transferred from the PLD chamber to ultrahigh vacuum (UHV) chambers for annealing, LEED, and ARPES studies. UHV annealing starting from 300 degrees C up to 550 degrees C, followed by LEED and ARPES measurements, show 1 x 1 surfaces with nondispersive energy-momentum bands. The 1 x 1 surface reconstructs into a root 2. x root 2R45 degrees one at an annealing temperature of 700 degrees C where the ARPES data show clear dispersive bands with a valence band maximum located around 3.3 eV below the Fermi level. While the root 2 x root 2R45 degrees surface reconstruction is stable under further UHV annealing, it is reversed to a 1 x 1 surface by annealing the sample in 400 mTorr oxygen at 600 degrees C. Another UHV annealing at 600 degrees C, followed by LEED and ARPES measurements, suggests that LEED root 2 x root 2R45 degrees surface reconstruction and ARPES dispersive bands are reproduced. Our results provide a better picture of the electronic structure of BaSnO3 surfaces and are suggestive of the role of oxygen vacancies in reversible root 2 x root 2R45 degrees surface reconstruction
URI
https://pr.ibs.re.kr/handle/8788114/7855
DOI
10.1103/PhysRevMaterials.4.055003
ISSN
2475-9953
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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