Enhanced superconductivity close to a non-magnetic quantum critical point in electron-doped strontium titanate

Y Tomioka, N Shirakawa, K Shibuya, IH Inoue - Nature communications, 2019 - nature.com
Studies on quantum critical points (QCP) have focused on magnetic QCPs to date.
Remarkable phenomena such as superconductivity due to avoided criticality have been …

Ferroelectric, quantum paraelectric, or paraelectric? Calculating the evolution from to to using a single-particle quantum mechanical description …

T Esswein, NA Spaldin - Physical Review Research, 2022 - APS
We present an inexpensive first-principles approach for describing quantum paraelectricity
that combines density functional theory (DFT) treatment of the electronic subsystem with …

Quantum critical phenomena in a compressible displacive ferroelectric

MJ Coak, CRS Haines, C Liu, SE Rowley… - Proceedings of the …, 2020 - pnas.org
The dielectric and magnetic polarizations of quantum paraelectrics and paramagnetic
materials have in many cases been found to initially increase with increasing thermal …

Pressure dependence of ferroelectric quantum critical fluctuations

MJ Coak, CRS Haines, C Liu, GG Guzmán-Verri… - Physical Review B, 2019 - APS
Phase transitions to a long-range-ordered state driven by a softened phonon mode are
ubiquitous across condensed matter physics, but the evolution of such a mode as the system …

Lamellar fluctuations melt ferroelectricity

GG Guzmán-Verri, CH Liang, PB Littlewood - Physical Review Letters, 2023 - APS
We consider a standard Ginzburg-Landau model of a ferroelectric whose electrical
polarization is coupled to gradients of elastic strain. At the harmonic level, such flexoelectric …

Structural and magnetic phases in pressure-tuned quantum materials

D Jarvis - 2020 - repository.cam.ac.uk
This thesis presents work exploring the use of pressure as a tuning parameter for exploring
the phase diagrams and properties of magnetically ordered insulators, to add understanding …

From Ferroelectricity to Quantum Paraelectricity—Evolution and Do** from First Principles

T Esswein - 2022 - research-collection.ethz.ch
Quantum paraelectric materials like SrTiO3 and KTaO3 exhibit many unusual material
properties arising from their quantum fluctuations, including a high dielectric constant and …