Journal
PHILOSOPHICAL MAGAZINE
Volume 89, Issue 22-24, Pages 1923-1932Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786430802558585
Keywords
multiferroic; magnetoelectric; phase transitions; doping; critical exponent; antiferromagnet; two-dimensional
Categories
Funding
- National Science Foundation [DMR-06044823]
- Wayne State University
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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 T-L = 6.4K can be approximately fit by power law behaviour, but exhibits different critical exponents above and below T-L. The two higher temperature magnetic transitions in (Ni1-xZnx)(3)V2O8, are strongly suppressed as the Zn doping fraction x is increased. The rates of the suppression of both T-H and T-L with x are consistent with two-dimensional spin systems, with the suppression of T-H consistent with Ising spins and the suppression of T-L consistent with Heisenberg spins.
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