Phys. Rev. Lett. 85, 1056–1059 (2000)Spin-1 Chain Doped with Mobile S = 1/2 FermionsReceived 15 December 1999; published in the issue dated 31 July 2000 We investigate the doping of a two-orbital chain with mobile S = 1/2 fermions as a valid model for Y2-xCaxBaNiO5. The S = 1 spins are stabilized by strong, ferromagnetic Hund's rule couplings. We calculate correlation functions and thermodynamic quantities by density matrix renormalization group methods and find a new hierarchy of energy scales in the spin sector upon doping. Gapless spin excitations are generated at a lower energy scale by interactions among itinerant polarons created by each hole and coexist with the larger scale of the gapful spin-liquid background of the S = 1 chain accompanied by a finite string order parameter. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.1056
DOI:
10.1103/PhysRevLett.85.1056
PACS:
71.70.Gm, 71.27.+a, 71.38.+i, 75.40.Mg
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