Double exchange magnets: Spin-dynamics in the paramagnetic phase

Peter Horsch; Janez Jaklic; Frank Mack

doi:10.1103/PhysRevB.59.R14149

Double exchange magnets: Spin-dynamics in the paramagnetic phase

强关联电子 2009-10-30 v1

作者: Peter Horsch , Janez Jaklic , Frank Mack

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摘要

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.

关键词

manganites perovskite magnetism magnetism

引用

@article{arxiv.cond-mat/9708007,
  title  = {Double exchange magnets: Spin-dynamics in the paramagnetic phase},
  author = {Peter Horsch and Janez Jaklic and Frank Mack},
  journal= {arXiv preprint arXiv:cond-mat/9708007},
  year   = {2009}
}

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Revtex, 4 pages with 5 postscript figures included

Double exchange magnets: Spin-dynamics in the paramagnetic phase

摘要

关键词

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