Spin 3/2 dimer model

Details Spin 3/2 dimer model Spin 3/2 dimer model

2009-01-30

arxiv.org/abs/0901.4900v3

EPL 86, 37005 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5+ pages, 6 figures; to appear in Europhysics Letters

Scientific paper

We present a parent Hamiltonian for weakly dimerized valence bond solid states for arbitrary half-integral S. While the model reduces for S=1/2 to the Majumdar-Ghosh Hamiltonian we discuss this model and its properties for S=3/2. 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.

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