Physics – Condensed Matter – Materials Science
Scientific paper
2007-12-13
Physica B 403 (2008) 3146-3153
Physics
Condensed Matter
Materials Science
16 pages, 6 figures, preprint submitted to Physica B
Scientific paper
10.1016/j.physb.2008.03.025
The magnetization process of the spin-1 Heisenberg dimer model with axial and rhombic single-ion anisotropy terms is particularly investigated in connection with recent experimental high-field measurements performed on the single-crystal sample of the homodinuclear nickel(II) compound [Ni2(Medpt)2(ox)(H2O)2](ClO4)2.2H2O (Medpt=methyl-bis(3-aminopropyl)amine). The results obtained from the exact numerical diagonalization reveal a striking magnetization process with a marked spatial dependence on the applied magnetic field for arbitrary but non-zero single-ion anisotropy. It is demonstrated that the field range, which corresponds to an intermediate magnetization plateau emerging at a half of the saturation magnetization, basically depends on single-ion anisotropy terms as well as a spatial orientation of the applied field. The breakdown of the intermediate magnetization plateau is discussed at length in relation to the single-ion anisotropy strength.
Baláž Pavel
Hagiwara Manabu
Jascur Michal
Kimura Sachie
Kindo Koichi
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