Breakdown of an intermediate plateau in the magnetization process of anisotropic spin-1 Heisenberg dimer: Theory vs. experiment
✍ Scribed by J. Strečka; M. Hagiwara; P. Baláž; M. Jaščur; Y. Narumi; S. Kimura; J. Kuchár; K. Kindo
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 361 KB
- Volume
- 403
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
The magnetization process of the spin-1 Heisenberg dimer model with the uniaxial or biaxial single-ion anisotropy is particularly investigated in connection with recent experimental high-field measurements performed on the single-crystal sample of the homodinuclear nickel(II) compound ½Ni 2 ðMedptÞ 2 ðm À oxÞðH 2 OÞ 2 ðClO 4 Þ 2 Á 2H 2 O (Medpt ¼ methyl-bis(3-aminopropyl)amine). The results obtained from the exact numerical diagonalization indicate a striking magnetization process with a marked spatial dependence on the applied magnetic field for arbitrary but finite 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 a single-ion anisotropy strength 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.