Superconducting dome underlying bipolaronic insulating state in charge-doped Ti4O7epitaxial films

Takuto Soma, Tomohiro Kobayashi, Kohei Yoshimatsu, Akira Ohtomo

Research output: Contribution to journalArticlepeer-review


The bipolaronic insulating (BI) state can cause the emergent superconducting phase when the strength of electron- phonon interaction is deliberately reduced. In this report, we have investigated electronic phase diagram of the wellknown BI compound Ti4O7 by analyzing the transport properties of over 40 epitaxial-film samples. The diagram captures the systematic suppression of the BI state with increasing the number of doped electrons and a superconducting dome located under the BI state. The coexistence of the BI and superconducting states suggests the bipolaronic superconductivity in Ti4O7 epitaxial films.

Original languageEnglish
Article number023705
Journaljournal of the physical society of japan
Issue number2
Publication statusPublished - 2021 Feb 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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