Double exchange magnets: Spin-dynamics in the paramagnetic phase

Abstract

The electronic structure of perovskite manganese oxides is investigated in terms of a Kondo lattice model with ferromagnetic Hund coupling and antiferromagnetic exchange between $t_{2g}$-spins using a finite temperature diagonalization technique. Results for the dynamic structure factor are consistent with recent neutron scattering experiments for the bilayer manganite La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ . The susceptibility shows Curie-Weiss behaviour and is used to derive a phase diagram. In the paramagnetic phase carriers are characterized as ferromagnetic polarons in an antiferromagnetic spin liquid.

Revtex, 4 pages with 5 postscript figures included

References in corpus (1)

• High Temperature Thermodynamics of the Ferromagnetic Kondo-Lattice Model

Cited by in corpus (8)

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• Defect states and spin-orbital physics in doped vanadates Y1-xCaxVO3
• Magnetic Polarons in the 1D FM Kondo Model
• Spin and lattice effects in the Kondo lattice model
• Modeling huge photoinduced spin polarons in intrinsic magnetic semiconductors
• Strongly anharmonic collective modes in a coupled electron-phonon-spin problem