Thermodynamics of Ising Antiferromagnets with Phantom Cross-link Network on Husimi Lattice

TL;DR

This paper investigates how phantom long-range interactions in a Husimi lattice affect the thermodynamics of antiferromagnetic Ising models, revealing glassy behaviors and metastable states through an exactly solvable toy model.

Contribution

It introduces a novel phantom cross-link network into the Husimi lattice to study long-range interactions and glassy phenomena in antiferromagnetic Ising models.

Findings

Phantom cross-link network induces glassy behavior in the model.

System exhibits supercooling and metastable entropy curves.

Kauzmann paradox observed in the thermodynamics.

Abstract

A second order cross-linked network is applied onto the classical Husimi lattice, to investigate the role of a "phantom" non-neighboring interactions of mid- and long-range in Bethe-like lattices for the first time. Since antiferromagnetic Ising model on Husimi lattice has been exactly solved and successfully presented the melting and glass transition, the Phantom Cross-link Network (PCN) is introduced here to understand the relationship between glassy defect and long-range interactions in small molecule systems, and the concept is inspired from the classical rubber network theory (Flory, 1985). One random site out of four on the recursive unites with certain distance I (the net size) is selected to be linked onto the PCN. The solutions are still in the fashion of normal antiferromagnetic Ising model, with expected frustrations along with the net size I. Beside the regular Curie transition, several interesting thermodynamics are observed in this toy model, and as the main found, PCN clearly introduces glassy portion into the system, identified by the supercooling behavior with lower TC, the metastable entropy curve and the Kauzmann paradox.