Weak antiferromagnetism and dimer order in quantum systems of coupled tetrahedra

Details Weak antiferromagnetism and dimer order in quantum systems of coupled tetrahedra Weak antiferromagnetism and dimer order in quantum systems of coupled tetrahedra

2004-04-28

arxiv.org/abs/cond-mat/0404674v5

Phys. Rev. B 70, 214401 (2004).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures; final version to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.214401

We analyze the phases of an S=1/2 spin model on a lattice of coupled tetrahedra. The presence of both Heisenberg and antisymmetric, Dzyaloshinsky-Moriya interactions can lead to two types of symmetry-broken states: non-magnetic dimer order and, unexpectedly, exotic 4 sub-lattice weak antiferromagnetic order - a state with a generically small ordered moment and non-zero chirality. External magnetic field also induces weak antiferromagnetism co-existing with strong dimer correlations in the ground state. These states are formed as a result of broken Ising symmetries and exhibit a number of unusual properties.

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