In this special issue of Physica A in memory Professor Dietrich Stauffer, I first recall my impression on him while being his postdoc for a year at HLRZ. the following scientific part, discuss theory soft phonons with quartic nonlinear interactions. This is applied to cubic crystal BaTiO$_3$ phase transition from para- ferroelectric phase.

Type-II multiferroics, where spin interactions induce a ferroelectric polarization, are interesting for new device functionalities due to large magnetoelectric coupling. We report on type of multiferroicity in the quadruple-perovskite BiMn3Cr4O12, an antiferromagnetic phase is induced by structural change at transition. The displacive nature transition 125 K, with crossover order-disorder mecha...

We use the model system ethanol–dodecane to demonstrate that giant critical fluctuations induced by easily accessible weak centrifugal fields as low 2000g can be observed above miscibility gap even far from point of a binary liquid mixture.

Abstract GeTe that exhibits a strong anharmonicity and ferroelectric phase transition between the rhombohedral cubic structures has emerged as one of leading thermoelectric materials. Herein, combining molecular dynamics simulations inelastic neutron scattering measurements, lattice in have been investigated to reveal soft-mode mechanisms across transition. We constructed first-principles-based...