Theory of superconductivity in doped quantum paraelectrics

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

doi:10.1038/s41535-022-00466-2

Title: Theory of superconductivity in doped quantum paraelectrics

Journal Article · 13 June 2022 · npj Quantum Materials

DOI: https://doi.org/10.1038/s41535-022-00466-2 · OSTI ID:1872239

;

; Raghu, S.;

Abstract Recent experiments on Nb-doped SrTiO ₃ 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 T ² resistivity in the normal state. Lastly, we discuss what physical insights SrTiO ₃ provides for superconductivity in other quantum paraelectrics such as KTaO ₃ .

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: Ministry of Education; Ministry of Science, ICT and Future Planning (MSIT); National Research Foundation of Korea (NRF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1872239

Journal Information:: npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 7; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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