Emergent superconductivity in doped ferroelectric hafnia

Abstract

Superconductivity and ferroelectricity,representing two distinct forms of ordered states, are typically not found together in the same system, making it even more difficult to create a connection between them. Here, supported by first-principles calculations, we propose that Anderson-Blount's ferroelectric-like metal can be manifested in electron-doped ferroelectric Pca2${}_1$ HfO${}_2$. In this system, polar phonons and consequently ferroelectricity are not affected by the presence of itinerant electrons. We find that a nonpolar optical phonon, being strongly coupled to doped electrons, can acquire a pronounced electron-phonon coupling strength to activate conventional Bardeen-Cooper-Schrieffer superconductivity. The displacements of polar oxygen atoms in Pca2${}_1$ HfO${}_2$ create a link between ferroelectricity and superconductivity, enabling a tunable superconducting temperature ranging approximately from 10 to 30 Kelvin. Owing to hafnia's compatibility with silicon, we suggest HfO${}_2$-based ferroelectric superconductors present an opportunity to construct high-performing hybrid integrated systems utilizing switchable quantum states.

14 pages, 4 figures

References in corpus (13)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• The Origin of Ferroelectricity in Hf${}_x$ Zr${}_{1-x}$ O${}_2$: A Computational Investigation and a Surface Energy Model
• Pathways Towards Ferroelectricity in Hafnia
• Coupled Ferroelectricity and Superconductivity in Bilayer $T_d$-MoTe${}_2$
• Structural Polymorphism Kinetics Promoted by Charged Oxygen Vacancies in HfO${}_2$
• Trilinear coupling driven ferroelectricity in HfO${}_2$
• Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal
• Superconductivity in SnO: a Nonmagnetic Analog to Fe-based Superconductors?
• Polar Metals Taxonomy for Materials Classification and Discovery
• Interplay between Ferroelectricity and Metallicity in BaTiO${}_3$
• First-principles study of the superconductivity in LaO
• Clues to potential dipolar-Kondo and RKKY interactions in a polar metal

Cited by in corpus (1)

• Progress in Computational Understanding of Ferroelectric Mechanisms in HfO${}_2$