Abstract
R 2BaNiO 5 (R = rare earth) quasi-1-D antiferromagnets are structurally equaivalent to the well-studied 1-D S = 1 Haldane-gap compounds Y 2BaNiO 5. Unlike the Y-nickelate though, these materials undergo 3-D magnetic ordering at finite temperatures. Recent inelastic neutron-scattering studies of Pr 2BaNiO 5 and (Nd x Y 1− x ) 2BaNiO 5 revealed purely 1-D gap excitations that propagate exclusively on the Ni-chains and are strikingly similar to Haldane-gap modes in Y 2BaNiO 5. In the ordered phase, these excitations survive and actually coexist with conventional spin waves. The results suggest that the Haldane-singlet ground state of the Ni-chains is not fully destroyed by Neél ordering.
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