Konstantin Rushchanskii

Melting of Pb Charge Glass and Simultaneous Pb–Cr Charge Transfer in PbCrO3 as the Origin of Volume Collapse

A metal to insulator transition in integer or half integer charge systems can be regarded as crystallization of charges. The insulating state tends to have a glassy nature when randomness or geometrical frustration exists. We report that the charge glass state is realized in a perovskite compound PbCrO3, which has been known for almost 50 years, without any obvious inhomogeneity or triangular arrangement in the charge system. PbCrO3 has a valence state of Pb(2+)(0.5)Pb(4+)(0.5)Cr(3+)O3 with Pb(2+)-Pb(4+) correlation length of three lattice-spacings at ambient condition. A pressure induced melting of charge glass and simultaneous Pb-Cr charge transfer causes an insulator to metal transition and ∼10% volume collapse.

Observation of nonequilibrium behavior near the Lifshitz point in ferroelectrics with incommensurate phase

We have investigated nonequilibrium properties of proper uniaxial

Ab Initio Phonon Structure of h-YMnO3 in Low-Symmetry Ferroelectric Phase

{\mathrm{Sn}}_{2}{\mathrm{P}}_{2}{({\mathrm{Se}}_{x}{\mathrm{S}}_{1\ensuremath{-}x})}_{6}

Theoretical Prediction and Direct Observation of Metastable Non-Polar Regions in Domain Structure of Sn2P2S6 Ferroelectrics with Triple-Well Potential

ferroelectrics with the type II incommensurate phase above Lifshitz point

Ab initio phase diagrams of Hf–O, Zr–O and Y–O: a comparative study

{x}_{\mathrm{LP}}\ensuremath{\sim}0.28

Rationalizing strain engineering effects in rare-earth nickelates

. We performed measurements of dielectric susceptibility in cooling and heating regimes with the rate ranging 0.002--0.1 K/min, as well as high-resolution ultrasound investigation and hypersound Brillouin scattering experiments. For samples with

Domain wall engineering as a route towards room temperature multiferroicity

x\ensuremath{\ge}0.28

Metastable states of HfO2 suboxides and resistive switching

clear anomalies are observed at incommensurate second-order transition

Ferroelectricity in (Pb

({T}_{i})

_y

and at first-order lock-in transition