Magnetic phase diagrams of the Kagome staircase compounds Co3V2O8 and Ni3V2O8

TL;DR

This study maps the magnetic phase diagrams of Kagome staircase compounds Co3V2O8 and Ni3V2O8 through low-temperature magnetisation measurements, revealing detailed phase boundaries and magnetic structures.

Contribution

It provides new H-T phase diagrams for Co3V2O8 and extends the phase diagram of Ni3V2O8 to higher magnetic fields, clarifying their magnetic behavior.

Findings

Phase diagrams for Co3V2O8 and Ni3V2O8 determined.

Incommensurate phase in Ni3V2O8 closes at ~90 kOe.

Magnetisation analysis supports proposed magnetic structures.

Abstract

An extensive low temperature magnetisation study of high quality single crystals of the Kagome staircase compounds Ni3V2O8 and Co3V2O8 has been performed, and the H-T phase diagrams have been determined from these measurements. The magnetisation and susceptibility curves for Co3V2O8 are analysed in terms of their compatibility with the different ferromagnetic and antiferromagnetic structures proposed for this compound. For Ni3V2O8, the phase diagram is extended to magnetic fields higher than previously reported; for a field applied along the a-axis, the low temperature incommensurate phase is found to close at around 90 kOe.