TY - JOUR
T1 - Increasing the Curie temperature of Ca2FeMoO6 double perovskite by introducing near-neighbour antiferromagnetic interactions
AU - Rubi, D.
AU - Frontera, C.
AU - Roig, A.
AU - Nogués, J.
AU - Muñoz, J. S.
AU - Fontcuberta, J.
PY - 2005/12/21
Y1 - 2005/12/21
N2 - We report on the magnetic, magnetotransport and structural characterization of (Ca1-yNdy)2Fe1+xMo 1-xO6 (x<0.5) ferromagnetic double perovskites. It is found that the presence of an excess (x>0) of Fe ions in the metallic sublattice produces a remarkable increase, by more than 90 K, of the Curie temperature. Mössbauer spectroscopy data indicate a reinforcement of the magnetic interactions. We argue that this dramatic enhancement of the ferromagnetic order is due to the strong antiferromagnetic superexchange coupling between near-neighbour Fe-Fe occupying regular and antisite positions in the structure. Moreover, the results indicate that the excess of magnetic ions (Fe) is essential to overcome the dilution effects caused by antisite defects. © 2005 IOP Publishing Ltd.
AB - We report on the magnetic, magnetotransport and structural characterization of (Ca1-yNdy)2Fe1+xMo 1-xO6 (x<0.5) ferromagnetic double perovskites. It is found that the presence of an excess (x>0) of Fe ions in the metallic sublattice produces a remarkable increase, by more than 90 K, of the Curie temperature. Mössbauer spectroscopy data indicate a reinforcement of the magnetic interactions. We argue that this dramatic enhancement of the ferromagnetic order is due to the strong antiferromagnetic superexchange coupling between near-neighbour Fe-Fe occupying regular and antisite positions in the structure. Moreover, the results indicate that the excess of magnetic ions (Fe) is essential to overcome the dilution effects caused by antisite defects. © 2005 IOP Publishing Ltd.
U2 - https://doi.org/10.1088/0953-8984/17/50/021
DO - https://doi.org/10.1088/0953-8984/17/50/021
M3 - Article
VL - 17
SP - 8037
EP - 8047
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
ER -