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28 March 2024
 
  » arxiv » cond-mat/0606053

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The study of nearest- and next-nearest-neighbor magnetic interactions in seven tetragonal compounds V(IV) containing linear chains and square lattices
L.M. Volkova ; S.A. Polyshchuk ;
Date 2 Jun 2006
Subject Materials Science
AbstractThe new crystal chemical method was used for calculation sign and strength not only nearest neighbors, but also additional next-nearest neighbor interactions on the basis of room-temperature structural data in tetragonal compounds Zn2(VO)(PO4)2 (I), (VO)(H2PO4)2 (II), (VO)SiP2O8 (III), (VO)SO4 (IV), (VO)MoO4 (V), Li2(VO)SiO4 (VI) and Li2(VO)GeO4 (VII) with similar sublattice of V4+ ions. The reason of distinction of the appropriate magnetic interactions in different compounds is established. It is shown that the main characteristic of these compounds is the strong dependence of strength of magnetic interactions and ordering type of magnetic moments from insignificant displacements of XO4 (X = P, Mo, Si or Ge) groups even without change of crystal symmetry. In addition to a widely researched square lattice the other specific geometrical configurations of ions V4+ are allocated, which can cause the frustration of magnetic interactions, such as: the linear chains along the c-axis with competing nearest- and next-nearest-neighbors interactions; rectangular (in I) and triangular (in II-VII) lattices with non-equivalent nearest-neighbor interactions, which it is possible to consider as n-leg ladders; one more square lattice in ab-plane with longer range interactions. It has been concluded that practically all magnetic interactions in these compounds compete among themselves.
Source arXiv, cond-mat/0606053
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