M. Kanada et al., ON THE MAGNETIC-PROPERTIES OF SYSTEMS WITH LOW-DIMENSIONAL LINKAGE OFVO5 PYRAMIDS, Journal of the Physical Society of Japan, 67(8), 1998, pp. 2904-2909
[N(CH3)(4)]V3O7, (en)(2)ZnV6O14 (en=ethylenediamine) and (C6H14N2)V6O1
4. H2O With edge-sharing VO5 chains have been prepared hydrothermally
and studied by magnetic susceptibility measurements and by NMR. Observ
ed magnetic properties, which indicate the existence of the spin gap;
can be explained by a model of isolated spin dimers of V4+ ions, where
a very large exchange interaction J exists only between the electrons
at V sites within two edge-sharing VO5 pyramids whose apical oxygens
are on the same side of the basal planes. It can be understood by cons
idering the kinetic exchange mechanism acting between the electrons in
the xy orbitals.