Superconducting dome in ferroelectric-type materials from soft mode instability

Abstract

We present a minimal theory of superconductivity enhancement in ferroelectric-type materials. Simple expressions for the optical mode responsible for the soft mode transition are assumed. A key role is played by the anharmonic phonon damping which is modulated by an external control parameter (electron doping or mechanical strain) causing the appearance of the soft mode. It is shown that the enhancement in the superconducting critical temperature $T_c$ upon approaching the ferroelectric transition from either side is due to the Stokes electron-phonon scattering processes promoted by strong phonon damping effects.

Synopsis in APS Physics at: https://physics.aps.org/articles/v15/s11

References in corpus (11)

• Fermi surface of the most dilute superconductor
• First-Principles Lattice Dynamics Method for Strongly Anharmonic Crystals
• Nonequilibrium Green's function method for phonon-phonon interaction and ballistic-diffusive thermal transport
• First-principles study of the mobility of SrTiO${}_3$
• Sharp optical phonon softening close to optimal doping in La${}_{2-x}$Ba${}_x$CuO${}_{4+\delta }$
• q-Dependence of the giant bond-stretching phonon anomaly in the stripe compound La1.48Nd0.4Sr0.12CuO4 measured by IXS
• Glass-induced enhancement of superconducting $T_c$: Pairing via dissipative mediators
• Soft mode theory of ferroelectric phase transitions in the low-temperature phase
• Theory of superconductivity due to Ngai's mechanism in lightly doped SrTiO3
• A large modulation of electron-phonon coupling and an emergent superconducting dome in doped strong ferroelectrics
• Phonon-Mediated Superconductivity near the Lattice Instability in Hole-doped Hydrogenated Monolayer Hexagonal Boron Nitride

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• Generalized Rashba Electron-Phonon Coupling and Superconductivity in Strontium Titanate
• Anharmonic theory of superconductivity and its applications to emerging quantum materials
• Interplay of magnetism and superconductivity in 2D extended Hubbard model
• Enhancement of Superconductivity in a Dirty Marginal Fermi Liquid
• Superconductivity in tin telluride films grown by molecular beam epitaxy
• Spin-dependent anisotropic electron-phonon coupling in KTaO${}_3$