Spin Waves in Canted Phases: An Application to Doped Manganites

Details Spin Waves in Canted Phases: An Application to Doped Manganites Spin Waves in Canted Phases: An Application to Doped Manganites

1999-11-29

arxiv.org/abs/cond-mat/9911471v2

Phys. Rev. B62 (2000) 3300

Physics

Condensed Matter

Strongly Correlated Electrons

34 pages, latex file, 1 eps included figure. Minor changes, published version

Scientific paper

10.1103/PhysRevB.62.3300

We present the effective lagrangian for low energy and momentum spin waves in canted phases at next to leading order in the derivative expansion. The symmetry breaking pattern SU(2) --> 1 of the internal spin group and that of the crystallographic space group imply that there is one ferromagnetic and one antiferromagnetic spin wave. The interaction of the spin waves with the charge carriers is also discussed for canted, ferromagnetic and antiferromagnetic phases. All this together allows us to write the doping dependence of the dispersion relation parameters for doped manganites. We point out that the spin waves posses distinctive characteristics which may allow us to experimentally differentiate canted phases from phase separation regions in doped manganites.

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