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  Presence of Delocalized Ti 3d Electrons in Ultrathin Single-Crystal SrTiO3

Chiu, C.-C., Ho, S.-Z., Lee, J.-M., Shao, Y.-C., Shen, Y., Liu, Y.-C., et al. (2022). Presence of Delocalized Ti 3d Electrons in Ultrathin Single-Crystal SrTiO3. Nano Letters, 22, 1580-1586. doi:10.1021/acs.nanolett.1c04434.

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 Creators:
Chiu, Chun-Chien1, Author
Ho, Sheng-Zhu1, Author
Lee, Jenn-Min1, Author
Shao, Yu-Cheng1, Author
Shen, Yang1, Author
Liu, Yu-Chen1, Author
Chang, Yao-Wen1, Author
Zheng, Yun-Zhe1, Author
Huang, Rong1, Author
Chang, Chun-Fu2, Author              
Kuo, Chang-Yang1, Author
Duan, Chun-Gang1, Author
Huang, Shih-Wen1, Author
Yang, Jan-Chi1, Author
Chuang, Yi-De1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863447              

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Free keywords: delocalized Ti 3d electrons, ferroelectricity, freestanding SrTiO3, RIXS, Electronic structure, Ferroelectric materials, Ruthenium compounds, Single crystals, Strontium titanates, Titanium compounds, Ultrathin films, 3d electron, Delocalized ti 3d electron, Emergent property, Freestanding SrTiO3, RIXS, Strain-free, Strongly correlated materials, Titanate films, Ultra-thin, Wide spectrum, Ferroelectricity
 Abstract: 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. ©

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Language(s): eng - English
 Dates: 2022-01-242022-01-24
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.nanolett.1c04434
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 22 Sequence Number: - Start / End Page: 1580 - 1586 Identifier: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403