Coexistence of Haldane gap excitations and long range antiferromagnetic order in mixed-spin nickelates R2 Ba Ni O5
S. Maslov, A. Zheludev
Abstract
The spin dynamics of the S=1 Ni-chains in mixed-spin antiferromagnets Pr2 Ba Ni O5 and Ndx Y2-x Ba Ni O5 is described in terms of a simple Ginzburg-Landau Lagrangian coupled to the sublattice of rare-earth ions. Within this framework we obtain a theoretical explanation for the experimentally observed coexistence of Haldane gap excitations and long-range magnetic order, as well as for the increase of the Haldane gap energy below the Neel point. We also predict that the degeneracy of the Haldane triplet is lifted in the magnetically ordered phase. The theoretical results are consistent with the available experimental data.
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