Volume 86, Number 3, May 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||14 May 2009|
Spin dimer model
Institut für Theorie der Kondensierten Materie, Universität Karlsruhe Postfach 6980, 76128 Karlsruhe, Germany, EU
Corresponding author: email@example.com
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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