Quantum Monte Carlo Simulations on S=1/2 antiferromagnetic-Ferromagnetic Random Alternating spin chain

TL;DR

This paper uses quantum Monte Carlo simulations to explore the finite temperature magnetic properties of a disordered S=1/2 Heisenberg chain with alternating AFM and FM bonds, relevant to a specific magnetic material.

Contribution

It introduces a detailed simulation study of a disordered spin chain with bond alternation, revealing finite temperature magnetic behaviors not previously characterized.

Findings

Finite temperature magnetic properties are characterized.

Relevance to experimental material (CH3)2CHNH3Cu(ClxBr1-x)3 is discussed.

Simulation results provide insights into the effects of bond randomness.

Abstract

The S=1/2 Heisenberg chain with bond alternation and randomness of antiferromagnetic (AFM) and ferromagnetic (FM) interactions is investigated by quantum Monte Carlo simulations of loop/cluster algorithm. Our results have shown interesting finite temperature magnetic properties of this model. The relevance of our study to the observed results of the material (CH$_3$)$_2$CHNH$_3$Cu(Cl$_x$Br$_{1-x}$)$_3$ is discussed.