An unusual superconducting Isotope Effect in the presence of a Quantum Criticality

Abstract

We discuss the possible connection between superconductivity (SC) and quantum critical points (QCP) for any QCP that is tunable by isotopic mass substitution. We find a distinct contribution to the isotope exponent, due to the proximity to a QCP, which can be used as an experimental signature for the relation between SC and QCP. The relation is demonstrated in a scenario where the SC pairing is due to modes related to a structural instability. Within this model the isotope exponent is derived in terms of microscopic parameters.

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• Quantum ferroelectric instabilities in superconducting SrTiO${}_3$
• A theory of criticality for quantum ferroelectric metals
• Emergent superconductivity in doped ferroelectric hafnia
• Domes of $T_c$ in single-band and multiband superconductors with finite-range attractive interactions
• A large modulation of electron-phonon coupling and an emergent superconducting dome in doped strong ferroelectrics