On the Two-Dimensional Character of the Magnetic Properties of Azurite Cu3(CO3)2(OH)2

TL;DR

This paper investigates the magnetic properties of Azurite, revealing its two-dimensional spin lattice structure and how its magnetic behavior can be modeled by combined contributions of dimers and chains, validated through experimental data.

Contribution

It demonstrates that Azurite's magnetic properties are governed by a two-dimensional spin lattice with interacting diamond chains, challenging the simpler one-dimensional models.

Findings

Azurite exhibits a two-dimensional spin lattice with interchain interactions.

Magnetic properties can be modeled by independent dimer and chain contributions.

Model predictions agree with susceptibility and specific heat measurements.

Abstract

The spin lattice appropriate for Azurite Cu3(CO3)2(OH)2 was determined by evaluating its spin exchange interactions on the basis of first principles density functional calculations. It is found that Azurite is not described by an isolated diamond chain with no spin frustration, but by a two-dimensional spin lattice in which diamond chains with spin frustration interact through the interchain spin exchange in the ab-plane. Our analysis indicates that the magnetic properties of Azurite at low temperatures can be approximated by two independent contributions, i.e., an isolated dimer and an effective uniform chain contributions. This prediction was verified by analyzing the magnetic susceptibility and specific heat data of Azurite.