Ferromagnetism in Electronic Models for Manganites

Details Ferromagnetism in Electronic Models for Manganites Ferromagnetism in Electronic Models for Manganites

1996-09-12

arxiv.org/abs/cond-mat/9609111v2

Phys. Rev. Lett 79, 713 (1997)

Physics

Condensed Matter

4 pages with 3 figures embedded in the text, Submitted for publication on August 20, 1996, Minor changes

Scientific paper

10.1103/PhysRevLett.79.713

Ground state properties of the Kondo model for manganese oxides in one dimension are studied using numerical techniques. The large Hund coupling ($J_{H}$) limit is specially analyzed. A robust region of fully saturated ferromagnetism (FM) is identified at all densities. For open boundary conditions it is shown exactly that the ground state is FM at $J_{H} = \infty$. Hole-spin phase separation competing with FM was also observed when a large exchange $J$ between the $Mn^{3+}$ ions is used. As the spin of the transition metal ion grows, the hole mobility decreases providing a tentative explanation for the differences between Cu-oxides and Mn-oxides.

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