Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-01-11
Europhys. Lett. 74, 896 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 3 Figures, submitted to EPL
Scientific paper
10.1209/epl/i2006-10039-3
Recently it was argued that quantum phase transitions can be radically different from classical phase transitions with as a highlight the 'deconfined critical points' exhibiting fractionalization of quantum numbers due to Berry phase effects. Such transitions are supposed to occur in frustrated ('$J_1$-$J_2$') quantum magnets. We have developed a novel renormalization approach for such systems which is fully respecting the underlying lattice structure. According to our findings, another profound phenomenon is around the corner: a fluctuation induced (order-out-of-disorder) first order transition. This has to occur for large spin and we conjecture that it is responsible for the weakly first order behavior recently observed in numerical simulations for frustrated $S=1/2$ systems.
Krüger Frank
Scheidl Stefan
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