Spin Diffusion in Double-Exchange Manganites

Details Spin Diffusion in Double-Exchange Manganites Spin Diffusion in Double-Exchange Manganites

2002-07-11

arxiv.org/abs/cond-mat/0207305v3

Phys. Rev. Lett. 90, 177202 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4.0 pages, 3 figures, RevTeX 4, replaced with the published version

Scientific paper

10.1103/PhysRevLett.90.177202

The theoretical study of spin diffusion in double-exchange magnets by means of dynamical mean-field theory is presented. We demonstrate that the spin-diffusion coefficient becomes independent of the Hund's coupling JH in the range of parameters JH*S >> W >> T, W being the bandwidth, relevant to colossal magnetoresistive manganites in the metallic part of their phase diagram. Our study reveals a close correspondence as well as some counterintuitive differences between the results on Bethe and hypercubic lattices. Our results are in accord with neutron scattering data and with previous theoretical work for high temperatures.

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