Spin-Peierls phases in pyrochlore antiferromagnets

Details Spin-Peierls phases in pyrochlore antiferromagnets Spin-Peierls phases in pyrochlore antiferromagnets

2002-04-08

arxiv.org/abs/cond-mat/0204154v1

Phys. Rev. B 66, 064403 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

REVTeX 4, 14 pages, 12 figures (best viewed in color)

Scientific paper

10.1103/PhysRevB.66.064403

In the highly frustrated pyrochlore magnet spins form a lattice of corner sharing tetrahedra. We show that the tetrahedral ``molecule'' at the heart of this structure undergoes a Jahn-Teller distortion when lattice motion is coupled to the antiferromagnetism. We extend this analysis to the full pyrochlore lattice by means of Landau theory and argue that it should exhibit spin-Peierls phases with bond order but no spin order. We find a range of Neel phases, with collinear, coplanar and noncoplanar order. While collinear Neel phases are easiest to generate microscopically, we also exhibit an interaction that gives rise to a coplanar state instead.

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