Effect of chemical substitution on the N[e-acute]el temperature of multiferroic Bi[sub 1 - x]Ca[sub x]FeO[sub 3]

Catalan, G. and Sardar, K. and Church, N. S. and Scott, J. F. and Harrison, R. J. and Redfern, S. A. T. (2009) Effect of chemical substitution on the N[e-acute]el temperature of multiferroic Bi[sub 1 - x]Ca[sub x]FeO[sub 3]. Physical Review B (Condensed Matter and Materials Physics), 79 (21). pp. 212415-4. DOI 10.1103/PhysRevB.79.212415

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Abstract

Multiferroic BiFeO3 ceramics have been doped with Ca and it is found that the magnetic Neel temperature (TNéel) increases as Ca concentration increases, at a rate of 0.66 K per 1% Ca (molar). The smaller ionic size of Ca compared with Bi results in a contraction of the lattice, suggesting that Ca doping can be regarded as a proxy for hydrostatic pressure, with an equivalence of 1% Ca=0.3 GPa. Combining these results, we argue that hydrostatic pressure should increase the magnetic transition temperature of BiFeO3 at a rate around [partial-derivative]TN/[partial-derivative]P~2.2 K/GPa. Our results also suggest that pressure (chemical or hydrostatic) may be used to bring the ferroelectric critical temperature Tc and the magnetic TNéel closer together, thereby enhancing magnetoelectric coupling, provided that electrical conductivity can be kept sufficiently low.

Item Type: Article
Uncontrolled Keywords: 09AREP; IA58;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Volume: 79
Page Range: pp. 212415-4
Identification Number: 10.1103/PhysRevB.79.212415
Depositing User: Sarah Humbert
Date Deposited: 14 Aug 2009 10:44
Last Modified: 23 Jul 2013 09:55
URI: http://eprints.esc.cam.ac.uk/id/eprint/1131

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