Abstract
Hole-doping effects in Haldane chain have been studied by means of magnetic susceptibility and Y89 nuclear magnetic resonance in Y2−xCaxBaNiO5 for x=0, x=0.06 and x=0.18. In nominally pure YBNO detailed information on this prototype of Haldane systems is extracted. In the charge-doped compounds the Y89 relaxation rates indicate that holes induce low-energy excitations with an effective spectral density having a structure characterized by a narrow central peak.
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