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Journal
2009 | 7 | 2 | 211-214
Article title

Single-ion anisotropy in a four-spin system: mixing of S-states

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EN
Abstracts
EN
A four-spin system with s=1 and the single-ion anisotropy, D∑ j [s jz ] 2 , is considered. When D≠0 the Hamiltonian of the system does not commute with S 2 and, therefore, S cannot be used as an additional label of energy levels. In this work we concentrate on the problem of mixing states with different total spins S. The Hamiltonian matrix is transformed to the symmetry-adapted basis (with subspaces labeled by the irreducible representations of the symmetry group) and next, after solving the eigenproblem for S 2, to the basis with vectors labeled by S. Each eigenproblem is solved exactly (at least numerically) and the eigenstates are expressed as ∑S a S ¦S〉. The coefficients aS are analyzed, especially for their D-dependence. Even in such a small system different schemes of level mixing can be observed. [...]
Publisher

Journal
Year
Volume
7
Issue
2
Pages
211-214
Physical description
Dates
published
1 - 6 - 2009
online
9 - 4 - 2009
Contributors
  • Faculty of Physics, Adam Mickiewicz University, 61-614, Poznan, Poland, florek@amu.edu.pl
  • Faculty of Physics, Adam Mickiewicz University, 61-614, Poznan, Poland
  • Faculty of Physics, Adam Mickiewicz University, 61-614, Poznan, Poland
  • Faculty of Physics, Adam Mickiewicz University, 61-614, Poznan, Poland
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11532-008-0103-7
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