6533b831fe1ef96bd1299895
RESEARCH PRODUCT
Transversal spin freezing and re-entrant spin glass phases in chemically disordered Fe-containing perovskite multiferroics
V.a.stephanovichV.v. Lagutasubject
Condensed Matter - Materials ScienceSpin glassMaterials scienceCondensed matter physicsSpinsExchange interactionMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesGeneral Physics and Astronomy02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesFerromagnetismLattice (order)0103 physical sciencesAntiferromagnetismCondensed Matter::Strongly Correlated ElectronsMultiferroicsPhysical and Theoretical Chemistry010306 general physics0210 nano-technologyAnisotropydescription
We propose experimental verification and theoretical explanation of magnetic anomalies in the complex Fe-contained double perovskite multiferroics like PbFe$_{1/2}$Nb$_{1/2}$O$_3$. The theoretical part is based on our model of coexistence of long-range magnetic order and spin glass in the above substances. In our model, the exchange interaction is anisotropic, coupling antiferromagnetically $z$ spin components of Fe$^{3+}$ ions. At the same time, the $xy$ components are coupled by much weaker exchange interaction of ferromagnetic sign. In the system with spatial disorder (half of corresponding lattice cites are occupied by spinless Nb$^{5+}$ ions) such frustrating interaction results in the fact that antiferromagnetic order is formed by $z$ projection of the spins, while their $xy$ components contribute to spin glass behaviour. Our theoretical findings are supported by the experimental evidence of coexistence of antiferromagnetic and spin glass phases in chemically disordered Fe-contained double perovskite multiferroics.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-12-29 | Physical Chemistry Chemical Physics |