Theory of superconductivity in doped quantum paraelectrics

Yue Yu, Harold Y. Hwang, S. Raghu, Suk Bum Chung

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Recent experiments on Nb-doped SrTiO3 have shown that the superconducting energy gap to the transition temperature ratio maintains the Bardeen–Cooper–Schrieffer (BCS) value throughout its superconducting dome. Motivated by these and related studies, we show that the Cooper pairing mediated by a single soft transverse-optical phonon is the most natural mechanism for such a superconducting dome given experimental constraints, and present the microscopic theory for this pairing mechanism. Furthermore, we show that this mechanism is consistent with the T2 resistivity in the normal state. Lastly, we discuss what physical insights SrTiO3 provides for superconductivity in other quantum paraelectrics such as KTaO3.

Original languageEnglish
Article number63
Journalnpj Quantum Materials
Issue number1
StatePublished - Dec 2022


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