Increasing the Curie temperature of Ca<inf>2</inf>FeMoO<inf>6</inf> double perovskite by introducing near-neighbour antiferromagnetic interactions

D. Rubi; C. Frontera; A. Roig; J. Nogués; J. S. Muñoz; J. Fontcuberta

doi:https://doi.org/10.1088/0953-8984/17/50/021

Increasing the Curie temperature of Ca<inf>2</inf>FeMoO<inf>6</inf> double perovskite by introducing near-neighbour antiferromagnetic interactions

D. Rubi, C. Frontera, A. Roig, J. Nogués, J. S. Muñoz, J. Fontcuberta

Department of Physics

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21 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	8037-8047
Journal	Journal of Physics Condensed Matter
Volume	17
DOIs	https://doi.org/10.1088/0953-8984/17/50/021
Publication status	Published - 21 Dec 2005

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@article{67294bb1c4fa4d3f8699cc052ad979f2,

title = "Increasing the Curie temperature of Ca2FeMoO6 double perovskite by introducing near-neighbour antiferromagnetic interactions",

abstract = "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. M{\"o}ssbauer 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. {\textcopyright} 2005 IOP Publishing Ltd.",

author = "D. Rubi and C. Frontera and A. Roig and J. Nogu{\'e}s and Mu{\~n}oz, {J. S.} and J. Fontcuberta",

year = "2005",

month = dec,

day = "21",

doi = "https://doi.org/10.1088/0953-8984/17/50/021",

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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

ER -

Increasing the Curie temperature of Ca<inf>2</inf>FeMoO<inf>6</inf> double perovskite by introducing near-neighbour antiferromagnetic interactions

Abstract

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