Orbital multicriticality in spin gapped quasi-1D antiferromagnets

Details Orbital multicriticality in spin gapped quasi-1D antiferromagnets Orbital multicriticality in spin gapped quasi-1D antiferromagnets

2011-03-12

arxiv.org/abs/1103.2473v2

Phys. Rev. B 84, 014407 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages

Scientific paper

Motivated by the quasi-1D antiferromagnet CaV$_2$O$_4$, we explore spin-orbital systems in which the spin modes are gapped but orbitals are near a macroscopically degenerate classical transition. Within a simplified model we show that gapless orbital liquid phases possessing power-law correlations may occur without the strict condition of a continuous orbital symmetry. For the model proposed for CaV$_2$O$_4$, we find that an orbital phase with coexisting order parameters emerges from a multicritical point. The effective orbital model consists of zigzag-coupled transverse field Ising chains. The corresponding global phase diagram is constructed using field theory methods and analyzed near the multicritical point with the aid of an exact solution of a zigzag XXZ model.

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