Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-06-05
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 Postscript figures. To appear in Eur. Phys. J B as a Rapid Note
Scientific paper
10.1007/s100510070242
One dimensional spin 1 systems may have a rich phase diagram including Haldane gap and dimerized phases if the usually very small biquadratic exchange becomes significant. We show that this unlikely condition may be fulfilled in electron systems with quasi-degenerate orbitals. This mechanism may have been experimentally realized in the spin 1 chain LiVGe$_2$O$_6$. The implications for the exploration of the physics and quantum chemistry of spin 1 chains are discussed.
Mila Frédéric
Zhang Fu Chun
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