Phase transition in a phonon gas with pair correlation

TL;DR

This paper investigates a phase transition in a phonon gas with pair correlations, developing a self-consistent model to describe its thermodynamics and discussing potential experimental observations of this novel phase.

Contribution

It introduces a self-consistent field model for phonon gases with pair correlations and explores their thermodynamic stability and phase transition behavior.

Findings

Phonon gas with pair correlations can exist in an unstable thermodynamic state.

A new theoretical framework for describing correlated phonon systems.

Discussion on experimental detection of the correlated phonon phase.

Abstract

The phase transition to the state of a phonon gas with pairwise correlations of interacting phonons with opposite momenta is studies. A method for describing such phonon systems within the framework of the self-consistent field model is developed and their thermodynamic characteristics are calculated. It is shown that a phonon gas with pair correlations can exist in a state of unstable thermodynamic equilibrium. The possibility of experimental observation of a solid in such a phase is discussed.