0000000000301185

AUTHOR

R. Blinc

showing 2 related works from this author

Magnetoelectric effect in mixed valency oxides mediated by charge carriers

2008

We show that the presence of free carriers in a substance can generate the multiferroic behavior. Namely, if the substance has mixed-valence ions, which can supply free carriers and have electric dipole and spin moments, all three types of long-range order (ferromagnetic, ferroelectric and magnetoelectric (ME)) can occur at low temperature. The physical origin of the effect is that charge carriers can mediate the multiferroic behavior via spin - spin (RKKY), dipole-dipole and dipole - spin interactions. Our estimate of the interaction magnitude shows that there exist an optimal carrier concentration, at which the strength of ME interaction is maximal and comparable to that of spin-spin RKKY…

Condensed Matter - Materials ScienceMaterials scienceRKKY interactionSpinsCondensed matter physicsMagnetoelectric effectGeneral Physics and AstronomyMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesDisordered Systems and Neural Networks (cond-mat.dis-nn)Condensed Matter - Disordered Systems and Neural NetworksFerroelectricityDipoleCondensed Matter::Materials ScienceFerromagnetismMultiferroicsCharge carrierCondensed Matter::Strongly Correlated ElectronsComputer Science::Databases
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Free Charge Carriers in Mixed Valency Oxides as Possible Mediators of Magnetoelectric Effect

2009

We show, that in a substance with mixed-valence ions, which can supply free carriers and have electric dipole and spin moments, three types of long-range order (ferromagnetic, ferroelectric and magnetoelectric (ME)) can occur at low temperatures. The origin of the effect is that free charge carriers can mediate the multiferroic behavior via spin – spin (RKKY), dipole-dipole and dipole - spin interactions. We show that there is an optimal carrier concentration, at which the strength of ME interaction is maximal and comparable to that of RKKY interaction. Our analysis shows that disorder and finite conductivity in the above substances does not suppress multiferroic effects.

RKKY interactionMaterials scienceCondensed matter physicsMagnetoelectric effectCondensed Matter PhysicsFerroelectricityElectronic Optical and Magnetic MaterialsCondensed Matter::Materials ScienceDipoleFerromagnetismCondensed Matter::Strongly Correlated ElectronsCharge carrierMultiferroicsSpin-½Ferroelectrics
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