Open Access
Superconductivity in Ti4O7 and γ-Ti3O5 films
Publication type: Journal Article
Publication date: 2017-10-02
scimago Q1
wos Q1
SJR: 0.874
CiteScore: 6.7
Impact factor: 3.9
ISSN: 20452322
PubMed ID:
28970575
Multidisciplinary
Abstract
Titanium dioxide is one of the most popular compounds among simple oxides. Except for the fully oxidized titanate, titanium oxides have partially filled d states and their exotic properties have captured attention. Here, we report on the discovery of superconductivity in Ti4O7 and γ-Ti3O5 in a thin film form. The epitaxial Ti4O7 and γ-Ti3O5 thin films were grown using pulsed-laser deposition on (LaAlO3)0.3–(SrAl0.5Ta0.5O3)0.7 and α-Al2O3 substrates, respectively. The highest superconducting transition temperatures are 3.0 K and 7.1 K for Ti4O7 and γ-Ti3O5, respectively. The mechanism behind the superconductivity is discussed on the basis of electrical measurements and previous theoretical predictions. We conclude that the superconductivity arises from unstabilized bipolaronic insulating states with the assistance of oxygen non-stoichiometry and epitaxial stabilization.
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60
Total citations:
60
Citations from 2025:
8
(13.33%)
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TY - JOUR
DO - 10.1038/s41598-017-12815-4
UR - https://doi.org/10.1038/s41598-017-12815-4
TI - Superconductivity in Ti4O7 and γ-Ti3O5 films
T2 - Scientific Reports
AU - Yoshimatsu, K.
AU - Sakata, O.
AU - Ohtomo, A.
PY - 2017
DA - 2017/10/02
PB - Springer Nature
IS - 1
VL - 7
PMID - 28970575
SN - 2045-2322
ER -
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@article{2017_Yoshimatsu,
author = {K. Yoshimatsu and O. Sakata and A. Ohtomo},
title = {Superconductivity in Ti4O7 and γ-Ti3O5 films},
journal = {Scientific Reports},
year = {2017},
volume = {7},
publisher = {Springer Nature},
month = {oct},
url = {https://doi.org/10.1038/s41598-017-12815-4},
number = {1},
pages = {12544},
doi = {10.1038/s41598-017-12815-4}
}