Ordering fluctuation dynamics inAuAgZn2

Ordering fluctuation dynamics in AuAgZn 2

Dynamics of fluctuation-dominated phase ordering: hard-core passive sliders on a fluctuating surface.

We study the dynamics of a system of hard-core particles sliding downwards on a one-dimensional fluctuating interface, which in a special case can be mapped to the problem of a passive scalar advected by a Burgers fluid. Driven by the surface fluctuations, the particles show a tendency to cluster, but the hard-core interaction prevents collapse. We use numerical simulations to measure the autoc...

Role of Orbitals in Manganese Oxides - Ordering and Fluctuation

We study the manganese oxides from the viewpoint of the strongly correlated doped Mott insulator. The magnetic ordering and the charge transport are governed by the orbital degrees of freedom, and their dimensionality is controlled by the anisotropic transfer integrals between the eg orbitals. As x increases the magnetic structure is predicted to change as A → F → A → C → G ( F : ferromagnet, A...

Fluctuation-driven magnetic hard-axis ordering in metallic ferromagnets.

We demonstrate that the interplay between soft electronic particle-hole fluctuations and magnetic anisotropies can drive ferromagnetic moments to point along a magnetic hard axis. As a proof of concept, we show this behavior explicitly for a generic two-band model with local Coulomb and Hund's interactions and a spin-orbit-induced easy plane anisotropy. The phase diagram is calculated within th...

Fluctuation Theorem for stochastic dynamics

The fluctuation theorem of Gallavotti and Cohen holds for finite systems undergoing Langevin dynamics. In such a context all non-trivial ergodic theory issues are by-passed, and the theorem takes a particularly simple form.