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Effect of chemical substitution on the Néel temperature of multiferroic Bi1-xCaxFeO3
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Catalan, Gustau, Sardar, Kripasindhu, Church, Nathan S., Scott, James F., Harrison, Richard J. and Redfern, Simon A. T. (2009) Effect of chemical substitution on the Néel temperature of multiferroic Bi1-xCaxFeO3. Physical Review B (Condensed Matter and Materials Physics), Vol.79 (No.21). Article no. 212415. doi:10.1103/PhysRevB.79.212415 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.79.212415
Abstract
Multiferroic BiFeO3 ceramics have been doped with Ca and it is found that the magnetic Neel temperature (T-Neacuteel) 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 T-N/partial derivative P similar to 2.2 K/GPa. Our results also suggest that pressure (chemical or hydrostatic) may be used to bring the ferroelectric critical temperature T-c and the magnetic T-Neacuteel closer together, thereby enhancing magnetoelectric coupling, provided that electrical conductivity can be kept sufficiently low.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | June 2009 | ||||
Dates: |
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Volume: | Vol.79 | ||||
Number: | No.21 | ||||
Number of Pages: | 4 | ||||
Page Range: | Article no. 212415 | ||||
DOI: | 10.1103/PhysRevB.79.212415 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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