Quasi-1d quantum helimagnets: The fate of multipolar phases

Details Quasi-1d quantum helimagnets: The fate of multipolar phases Quasi-1d quantum helimagnets: The fate of multipolar phases

2010-05-30

arxiv.org/abs/1005.5500v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, as compared with the 1st version: new title, inclusion of 2D-phase diagrams, as well as addition of exact

Scientific paper

Coupled frustrated spin-1/2 chains in high magnetic fields described within the ferro- antiferromagnetic J1-J2 Heisenberg model are studied by the DMRG, the hard core boson, and the spin wave theory approaches. Multipolar phases related to magnon bound states are destroyed (supported) by weak antiferromagnetic (ferromagnetic) interchain couplings Jic. We show that quantum spin nematics might be found for LiVCuO4 whereas for Li(Na)Cu2O2 it is prevented by a sizeable antiferromagnetic Jic. Also for Li2ZrCuO4 with a small antiferromagnetic Jic expected triatic or quartic phases are unlikely, too. The saturation field is found to be strongly affected even by a relatively small Jic.

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