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We provide evidence of an intermediate Haldane phase in a spin-2 quantumchain. By combining effective field theory and numerical approaches, we showthat the phase diagram of the proposed model includes SO(5) Haldane,intermediate Haldane, and large-D phases. We determine the characteristicproperties of these phases, including edge states, string order parameters, anddegeneracies in the entanglement spectrum. The symmetries responsible for thedegeneracy patterns observed in the entanglement spectrum are also discussed.

Intermediate Haldane phase in spin-2 quantum chains with uniaxial anisotropy