Anharmonic specific heat of solid UO2

Anharmonic lattice dynamics of solid potassium

An intcrionic potential proposed by Dagcns, Rasolt, and Taylor has been used in classical computcrsimulation experiments on solid K at 162.5 and 311 K. Results for the dynamical structure factor S{gre) are compared with lattice-dynamical calculations employing the self-consistent harmonic approximation plus cubic anharmonic corrections. The lattice&ynamical calculations are in good accord with ...

Specific heat, Energy Fluctuation and Entropy of Isotropic Harmonic and Anharmonic Oscillators

Normal heat conductivity in a periodic chain of anharmonic oscillators

We consider a periodic chain of coupled and pinned anharmonic oscillators subject to a nonequilibrium random forcing. Assuming that the six-point correlation functions of the stationary state factorize in terms of the two-point correlation functions, we show that the heat current going through the system is consistent with Fourier law and that the conductivity behaves as κ ∼ 1 λ2T2 where λ is t...

Effective phonons in anharmonic lattices: anomalous vs normal heat conduction

– We study heat conduction in one dimensional (1D) anharmonic lattices analytically and numerically by using an effective phonon theory. It is found that every effective phonon mode oscillates quasi-periodically. By weighting the power spectrum of the total heat flux in the Debye formula, we obtain a unified formalism that can explain anomalous heat conduction in momentum conserved lattices wit...

Heat conduction in a three dimensional anharmonic crystal.

We perform nonequilibrium simulations of heat conduction in a three dimensional anharmonic lattice. By studying slabs of length N and width W, we examine the crossover from one dimensional to three dimensional behavior of the thermal conductivity kappa. We find that for large N, the crossover takes place at a small value of the aspect ratio W/N. From our numerical data we conclude that the thre...