Nanoscale phase separation in manganites

Abstract

We study the possibility of nanoscale phase separation in manganites in the framework of the double exchange model. The homogeneous canted state of this model is proved to be unstable toward the formation of small ferromagnetic droplets inside an antiferromagnetic insulating matrix. For the ferromagnetic polaronic state we analyze the quantum effects related to the tails of electronic wave function and a possibility of electron hopping in the antiferromagnetic background. We find that these effects lead to the formation of the threshold for the polaronic state.

10 pages, 2 figures, invited talk on the workshop on Strongly Correlated Electrons in New Materials (SCENM02), Loughborough (UK). submitted to Journal of Physics A: Mathematical and General

References in corpus (8)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
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• Double-exchange model: phase separation versus canted spins
• Resistivity and 1/f Noise in Non-Metallic Phase Separated Manganites
• Anomalous Shift of Chemical Potential in the Double-Exchange Systems
• Phase separation in systems with charge ordering
• Field-induced segregation of ferromagnetic nano-domains in Pr${}_{0.5}$Sr${}_{0.5}$MnO${}_3$, detected by ${}^{55}$Mn NMR

Cited by in corpus (9)

• Electronic phase separation: recent progress in the old problem
• Magnetic field dependence of the magnetic phase separation in Pr1-xCaxMnO3 manganites studied by small-angle neutron scattering
• Small-scale phase separation in doped anisotropic antiferromagnets
• Ferromagnetic polarons in the one-dimensional ferromagnetic Kondo model with quantum mechanical S=3/2 core spins
• Probing the magnetic state by linear and non linear ac magnetic susceptibility measurements in under doped manganite Nd0.8Sr0.2MnO3
• Magnetic polarons in doped 1D antiferromagnetic chain
• Polaronic Aspects of the two-dimensional Ferromagnetic Kondo Model
• Electronic ferroelectricity and magneto-electric effect in phase separated magnetic oxidesElectronic ferroelectricity and magneto-electric effect in phase separated magnetic oxides
• Stripe structures in phase separated magnetic oxides