Volume 74, Number 5, June 2006
|Page(s)||896 - 902|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||05 May 2006|
Frustrated Heisenberg antiferromagnets: Fluctuation-induced first order vs. deconfined quantum criticality
Instituut-Lorentz, Universiteit Leiden - P.O. Box 9506 2300 RA Leiden, The Netherlands
2 Institut für Theoretische Physik, Universität zu Köln Zülpicher Str. 77, D-50937 Köln, Germany
Accepted: 7 April 2006
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 (“J1-J2”) 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 systems.
PACS: 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 75.50.Ee – Antiferromagnetics / 05.10.Cc – Renormalization group methods
© EDP Sciences, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.