S. E. Rowley

TL;DR: In this article, the same authors describe quantum criticality in insulators in which the electric moments are fluctuating over a wider temperature range than in quantum critical metals, and show that these too can be described by the same framework.

TL;DR: In this article, a self-contained overview of ferroelectrics near quantum phase transitions is provided, where the quantum critical point can be tuned experimentally to reside at, above or below its upper critical dimension; this feature allows for detailed interplay between experiment and theory using both scaling and self-consistent field models.

TL;DR: Evidence of the susceptibility varying as 1/T3 is presented, i.e. with a critical exponent γ = 3, for BaFe12O19, an incipient ferroelectric with an expected ferro electric phase transition extrapolated to lie at 6 K but suppressed due to quantum fluctuations.

TL;DR: The nature of long-range dipole interactions in uniaxial materials, which lead to non-analytical terms in the free-energy expansion in the polarization, predict a dielectric susceptibility varying as 1/T(3)close to the quantum critical point, but this is not found.

TL;DR: This key issues article aims to provide a self-contained overview of ferroelectrics near quantum phase transitions with open questions for future research that include textured polarization states and unusual forms of superconductivity that remain to be understood theoretically.