Semiquantitative theory for high-field low-temperature properties of a distorted diamond spin chain

TL;DR

This paper develops a semiquantitative theoretical approach to analyze the high-field, low-temperature magnetic properties of a distorted diamond spin chain, extending localized-magnon concepts to non-ideal geometries.

Contribution

It introduces a modified localized-magnon theory for distorted geometries, providing insights into magnetic behavior of real materials like azurite.

Findings

Partition function form remains similar to ideal case with slight dispersion

The theory applies to azurite, a real material with distorted diamond chains

Provides a framework for understanding high-field low-temperature properties

Abstract

We consider the antiferromagnetic Heisenberg model on a distorted diamond chain and use the localized-magnon picture adapted to a distorted geometry to discuss some of its high-field low-temperature properties. More specifically, in our study we assume that the partition function for a slightly distorted geometry has the same form as for ideal geometry, though with slightly dispersive one-magnon energies. We also discuss the relevance of such a description to azurite.