New Haldane gap compounds with S=1 have been characterized by single-crystal X-ray analyses and magnetic measurements. From these results, it has been found that the magnitude of the Haldane gaps can be controlled by substituting the bridging groups and In-plane ligands. The magnetic measurements of quasi-one-dimensional halogen-bridged blnuclear Ru complexes with S=3/2, Ru2(CHaCOO).4X (X=C1, Br and I) have revealed that the Br- and I-bridged compounds show one-dimensional antiferromagnetic interactions but no spin-Pelerls transition over the temperature range measured, while the Cl-bridged compound shows no magnetic interaction among blnuclear Ruz units through the bridging Cl~ ions along the chain but spin-crossover behavior between S=3/2 and 1/2 in the blnuclear Ruz unit. The oxalato-bridged Fea+ compound with S=2, Fe(ox).2HaO has no Haldane gap but shows metamagnetlsm under the high magnetic field.
|Number of pages||8|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals|
|Publication status||Published - 1995 Nov|
ASJC Scopus subject areas
- Condensed Matter Physics