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The pseudo-one dimensional brannerite type compound CoV2O6 has been studiedby 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 unusualbalance of exchange interactions (CW= 2.8(2) K) and a single antiferromagnetictransition at TN = 7 K. M(H) isotherms recorded below 5 K show a metamagnetictransition and a 1/3 magnetisation plateau. From 5-7 K, only the metamagnetictransition is observed. For T < TN < ~ 25 K, our heat capacity andmagnetisation measurements show evidence for strong low dimensionalferromagnetic fluctuations. We propose a simple phase diagram, discuss theprinciple features and emphasise the importance of Ising anisotropy.

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