1997/06/30 by Sergei Maslov, S. Maslov, A. Zheludev · 8 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.57.68
published as Phys. Rev. B 57, 68 (1998). · 4 pages, 1 figure, submitted to PRL An alternative derivation of main results and new references added
arxiv created 1997/07/24 · openalex publication_date 1998/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.