Diamond chains with multiple-spin exchange interactions

Details Diamond chains with multiple-spin exchange interactions Diamond chains with multiple-spin exchange interactions

2008-11-30

arxiv.org/abs/0812.0133v2

Phys. Rev. B 79, 104412 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

6 PRB pages, Added references

Scientific paper

10.1103/PhysRevB.79.104412

We study the phase diagram of a symmetric spin-1/2 Heisenberg diamond chain with additional cyclic four-spin exchange interactions. The presented analysis supplemented by numerical exact-diagonalization results for finite periodic clusters implies a rich phase diagram containing, apart from standard magnetic and spin-liquid phases, two different tetramer-dimer phases as well as an exotic four-fold degenerate dimerized phase. The characteristics of the established spin phases as well as the nature of quantum phase transitions are discussed, as well.

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