Metamagnetism and 1/3 Plateau in the Spin Chain Compound CoV2O6

TL;DR

This study investigates the magnetic properties of CoV2O6, revealing metamagnetism, a 1/3 magnetisation plateau, and low-dimensional ferromagnetic fluctuations, highlighting the role of Ising anisotropy in this spin chain compound.

Contribution

It provides the first detailed magnetic phase diagram of CoV2O6, emphasizing the significance of Ising anisotropy and low-dimensional fluctuations in its magnetic behavior.

Findings

Observation of a 1/3 magnetisation plateau below 5 K

Identification of a metamagnetic transition in M(H) isotherms

Evidence for strong low-dimensional ferromagnetic fluctuations

Abstract

The pseudo-one dimensional brannerite type compound CoV2O6 has been studied by magnetisation and heat capacity measurements in the temperature range 1.8 < T < 300 K and in applied fields of up to 9 T. Our measurements show an unusual balance of exchange interactions (CW= 2.8(2) K) and a single antiferromagnetic transition at TN = 7 K. M(H) isotherms recorded below 5 K show a metamagnetic transition and a 1/3 magnetisation plateau. From 5-7 K, only the metamagnetic transition is observed. For T < TN < ~ 25 K, our heat capacity and magnetisation measurements show evidence for strong low dimensional ferromagnetic fluctuations. We propose a simple phase diagram, discuss the principle features and emphasise the importance of Ising anisotropy.