TY - JOUR
T1 - Effect of chemical substitution on the Néel temperature of multiferroic Bi1-x Cax FeO3
AU - Catalan, Gustau
AU - Sardar, Kripasindhu
AU - Church, Nathan S.
AU - Scott, James F.
AU - Harrison, Richard J.
AU - Redfern, Simon A.T.
PY - 2009/6/30
Y1 - 2009/6/30
N2 - 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 TN / 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.
AB - 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 TN / 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.
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U2 - 10.1103/PhysRevB.79.212415
DO - 10.1103/PhysRevB.79.212415
M3 - Article
AN - SCOPUS:68949104143
SN - 1098-0121
VL - 79
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 21
M1 - 212415
ER -