Susceptibility of the Spin 1/2 Heisenberg Antiferromagnetic Chain

TL;DR

This paper provides highly accurate calculations of the magnetic susceptibility of the spin 1/2 Heisenberg antiferromagnetic chain across all temperatures, revealing detailed temperature-dependent behavior using advanced theoretical methods.

Contribution

It offers comprehensive susceptibility data for all temperatures using Bethe ansatz and field theory, improving understanding of the model's thermodynamic properties.

Findings

Susceptibility exhibits a rounded peak at intermediate temperatures.

At zero temperature, susceptibility approaches a finite asymptotic value.

The approach to zero temperature involves an infinite slope in susceptibility.

Abstract

Highly accurate results are presented for the susceptibility, $\chi (T)$ of the $s=1/2$ Heisenberg antiferromagnetic chain for all temperatures, using the Bethe ansatz and field theory methods. After going through a rounded peak, $\chi (T)$ approaches its asympotic zero-temperature value with infinite slope.