Noncoplanar spin canting in lightly-doped ferromagnetic Kondo lattice model on a triangular lattice

Abstract

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.

6 pages, 4 figures, accepted for publication in J. Phys.: Conf. Ser

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• High harmonic generation from electrons moving in topological spin textures
• Ground-state phase diagram of the Kondo lattice model on triangular-to-kagome lattices
• Photocontrol of spin scalar chirality in centrosymmetric itinerant magnets
• Electronic route to stabilize nanoscale spin textures in itinerant frustrated magnets
• Quantum Magnetism in Wannier-Obstructed Mott Insulators