We have studied phase transitions in multiferroic Ni3V2O8, through dielectric measurements and by investigating the effects of Zn doping. The divergence of the dielectric constant near TL = 6.4 K can be approximately fit by power law behaviour, but exhibits different critical exponents above and below TL. The two higher temperature magnetic transitions in (Ni1-xZnx)3V2O8, are strongly suppressed as the Zn doping fraction x is increased. The rates of the suppression of both TH and TL with x are consistent with two-dimensional spin systems, with the suppression of TH consistent with Ising spins and the suppression of TL consistent with Heisenberg spins.

Ambesh Dixit

Department of Physics

IIT Jodhpur

P. Kharel

A. Kumarasiri

N. Rogado

R.J. Cava

G. Lawes

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Scaling behaviour of magnetic transitions in Ni3V2O8

Philosophical Magazine

Journal	Philosophical Magazine
ISSN	14786435