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.
ASJC Scopus subject areas
- Physics and Astronomy(all)