Transversal spin freezing and re-entrant spin glass phase in chemically disordered Fe-contained double perovskite multiferroics

Abstract

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.

6 pages, 4 figures

References in corpus (3)

• Spin-glass state and long-range magnetic order in Pb(Fe1/2Nb1/2)O3
• Magnetic interactions in disordered perovskite PbFe_{1/2}Nb_{1/2}O_3 and related compounds. Dominance of nearest-neighbor interaction
• Role of dimensionality in spontaneous magnon decay: easy-plane ferromagnet

Cited by in corpus (5)

• Magnetoelectric effect in antiferromagnetic multiferroic Pb(Fe1/2Nb1/2)O3 and its solid solutions with PbTiO3
• Lévy flights in the infinite potential well as the hypersingular Fredholm problem
• Lévy flights confinement in a parabolic potential and fractional quantum oscillator
• Cluster superconductivity in the magnetoelectric Pb(Fe1/2Sb1/2)O3 ceramics
• Fast broadband cluster spin-glass dynamics in PbFe${}_{1/2}$Nb${}_{1/2}$O${}_3$