Doping dependence of the dipolar correlation length scale in metallic SrTiO3

Benoît Fauqué (), Shan Jiang, Tom Fennell, Bertrand Roessli, Alexandre Ivanov, Celine Roux-Byl, Benoît Baptiste, Philippe Bourges, Kamran Behnia and Yasuhide Tomioka
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Benoît Fauqué: JEIP (USR 3573 CNRS), Collège de France
Shan Jiang: JEIP (USR 3573 CNRS), Collège de France
Tom Fennell: PSI Center for Neutron and Muon Sciences
Bertrand Roessli: PSI Center for Neutron and Muon Sciences
Alexandre Ivanov: Intitut Laue Langevin
Celine Roux-Byl: Université PSL
Benoît Baptiste: IMPMC-Sorbonne Université and CNRS
Philippe Bourges: CEA-CNRS, Université Paris-Saclay
Kamran Behnia: Université PSL
Yasuhide Tomioka: National Institute of Advanced Industrial Science and Technology (AIST)

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Superconducting domes, ubiquitous across a variety of quantum materials, are often understood as a window in which pairing is favored, opened by the fluctuations of competing orders. Yet, the understanding of how such a window closes is missing. Here, we show that inelastic neutron scattering, by quantifying a length scale associated with the dipoles correlation, ℓ0, addresses this issue. We find that, within the experimental precision, the end of the superconducting dome coincides with the end of a highly polarizable state (in which ℓ0 is longer than the interatomic distance). Thus, the superconducting dome is driven by the competition between the increase in the density of states and the inevitable collapse of the quantum paraelectric phase. This is compatible with a crucial role played by the soft ferroelectric mode in driving superconductivity. Such a scenario may also be at work in other quantum paraelectric materials, either bulk or at interfaces.

Date: 2025
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DOI: 10.1038/s41467-025-56806-w

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