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Presence of Delocal...
Presence of Delocalized Ti 3d Electrons in Ultrathin Single-Crystal SrTiO3
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- Chiu, Chun Chien (author)
- National Cheng Kung University
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- Ho, Sheng Zhu (author)
- National Cheng Kung University
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- Lee, Jenn Min (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Shao, Yu Cheng (author)
- National Synchrotron Radiation Research Center Taiwan,Advanced Light Source, Berkeley
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- Shen, Yang (author)
- East China Normal University
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- Liu, Yu Chen (author)
- National Cheng Kung University
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- Chang, Yao Wen (author)
- National Cheng Kung University
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- Zheng, Yun Zhe (author)
- East China Normal University
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- Huang, Rong (author)
- East China Normal University
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- Chang, Chun Fu (author)
- Max Planck Institute for Chemical Physics of Solids
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- Kuo, Chang Yang (author)
- National Chiao Tung University,National Synchrotron Radiation Research Center Taiwan
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- Duan, Chun Gang (author)
- East China Normal University
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- Huang, Shih Wen (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Paul Scherrer Institute
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- Yang, Jan Chi (author)
- National Cheng Kung University
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- Chuang, Yi De (author)
- Advanced Light Source, Berkeley
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(creator_code:org_t)
- 2022-01-24
- 2022
- English 7 s.
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In: Nano Letters. - : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 22:4, s. 1580-1586
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http://dx.doi.org/10...
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Abstract
Subject headings
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- Strontium titanate (STO), with a wide spectrum of emergent properties such as ferroelectricity and superconductivity, has received significant attention in the community of strongly correlated materials. In the strain-free STO film grown on the SrRuO3 buffer layer, the existing polar nanoregions can facilitate room-temperature ferroelectricity when the STO film thickness approaches 10 nm. Here we show that around this thickness scale, the freestanding STO films without the influence of a substrate show the tetragonal structure at room temperature, contrasting with the cubic structure seen in bulk form. The spectroscopic measurements reveal the modified Ti-O orbital hybridization that causes the Ti ion to deviate from its nominal 4+ valency (3d0 configuration) with excess delocalized 3d electrons. Additionally, the Ti ion in TiO6 octahedron exhibits an off-center displacement. The inherent symmetry lowering in ultrathin freestanding films offers an alternative way to achieve tunable electronic structures that are of paramount importance for future technological applications.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- delocalized Ti 3d electrons
- ferroelectricity
- freestanding SrTiO
- RIXS
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Chiu, Chun Chien
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Ho, Sheng Zhu
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Lee, Jenn Min
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Shao, Yu Cheng
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Shen, Yang
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Liu, Yu Chen
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show more...
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Chang, Yao Wen
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Zheng, Yun Zhe
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Huang, Rong
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Chang, Chun Fu
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Kuo, Chang Yang
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Duan, Chun Gang
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Huang, Shih Wen
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Yang, Jan Chi
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Chuang, Yi De
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Nano Letters
- By the university
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Lund University