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arXiv:cond-mat/0304311 · Journal of Magnetism and Magnetic Materials

Spin frustration in an exactly solvable Ising–Heisenberg diamond chain

M. Jaščur, Jozef Strečka

Published Jan 22, 2004• 19 citations
arXivHTMLPDF
DOI
10.1016/j.jmmm.2003.12.167

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We consider a geometrically frustrated spin-(1/2) Ising-Heisenberg diamond chain, which is an exactly solvable model when assuming part of the exchange interactions as Heisenberg ones and another part as Ising ones. A small XY part is afterwards perturbatively added to the Ising couplings, which enabled us to derive an effective Hamiltonian describing the low-energy behavior of the modified but full quantum version of the initial model. The effective model is much simpler and free of frustration. It is shown that the XY part added to the originally Ising interaction gives rise to the spin-liquid phase with continuously varying magnetization, which emerges between the magnetization plateaus and is totally absent in the initial hybrid diamond-chain model. The elaborated approach can also be applied to other hybrid Ising-Heisenberg spin systems.