A Theory for a Self-Trapped Antiferromagnetic Polaron at T=0 K

概要

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Self-trapped antiferromagnetic polaron at T=0 K is studied for the localized moments of the classical spin limit. Nonlinear effect, which is most important for the magnetic polaron, is taken into account completely. It is found that when the band width is larger than the s-f exchange energy, the direction of the electron spin is nearly constant and then, for the exchange energy between the localized spins smaller than a critical value, a large magnetic polaron can exist in which the localized spin within the polaron is nearly completely saturated. When the former becomes smaller than the latter, however, the electron spin follows after the localized spins and then the magnetic polaron becomes unstable for the limit of the narrow band, contrary to the case of the usual lattice phonon polaron. The situation is, however, sensitive to the type of the magnetic ordering and the transfer matrix.
社団法人日本物理学会の論文
1972-09-05