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It is commonly believed that strongly interacting one-dimensional Fermisystems with gapless excitations are effectively described by Luttinger liquidtheory. However, when the temperature of the system is high compared to thespin energy, but small compared to the charge energy, the system becomes"spin-incoherent". We present numerical evidence showing that theone-dimensional "t-J-Kondo" lattice, consisting of a t-J chain interacting withlocalized spins, displays all the characteristic signatures of spin-incoherentphysics, but in the {\it ground state}. We argue that similar physics may bepresent in a wide range of strongly interacting systems.

Spin-incoherent behavior in the ground state of strongly correlated systems