Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-02-24
J. Phys.: Conf. Ser. 320, 012059 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 4 figures, accepted for publication in J. Phys.: Conf. Ser
Scientific paper
Effect of the coupling to mobile carriers on the 120$^\circ$ antiferromagnetic state is investigated in a ferromagnetic Kondo lattice model on a frustrated triangular lattice. Using a variational calculation for various spin orderings up to a four-site unit cell, we identify the ground-state phase diagram with focusing on the lightly-doped region. We find that an electron doping from the band bottom immediately destabilizes a 120$^\circ$ coplanar antiferromagnetic order and induces a noncoplanar three-sublattice ordering accompanied by an intervening phase separation. This noncoplanar phase has an umbrella-type spin configuration with a net magnetic moment and a finite spin scalar chirality. This spin-canting state emerges in competition between the antiferromagnetic superexchange interaction and the ferromagnetic double-exchange interaction under geometrical frustration. In contrast, a hole doping from the band top retains the 120$^\circ$-ordered state up to a finite doping concentration and does not lead to a noncolpanar ordering.
Akagi Yutaka
Motome Yukitoshi
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