Issue |
EPL
Volume 86, Number 3, May 2009
|
|
---|---|---|
Article Number | 37005 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/86/37005 | |
Published online | 14 May 2009 |
Spin
dimer model
Institut für Theorie der Kondensierten Materie, Universität Karlsruhe Postfach 6980, 76128 Karlsruhe, Germany, EU
Corresponding author: rachel@tkm.uni-karlsruhe.de
Received:
3
February
2009
Accepted:
9
April
2009
We present a parent Hamiltonian for weakly dimerized valence bond solid
states for arbitrary half-integral S. While
the model reduces for
to the Majumdar-Ghosh Hamiltonian, we discuss this model and its properties for
. Its degenerate ground state is the most popular toy model state for discussing dimerization in spin 3/2 chains. In particular, it describes the impurity-induced dimer phase in Cr8Ni as proposed recently. We point out that the explicit construction of the Hamiltonian and its main features apply to arbitrary half-integral spin S.
PACS: 75.10.Pq – Spin chain models / 75.10.Dg – Crystal-field theory and spin Hamiltonians / 75.10.Jm – Quantized spin models
© EPLA, 2009
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