Biconical critical dynamics
Institute for Theoretical Physics, Johannes Kepler University Linz - Altenbergerstrasse 69, A-4040, Linz, Austria, EU
2 Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine - Svientsitskii Str. 1, UA-79011 Lviv, Ukraine
3 Department for Material Research and Physics, Paris Lodron University Salzburg - Hellbrunnerstrasse 34, A-5020 Salzburg, Austria, EU
Accepted: 5 August 2010
A complete two-loop renormalization group calculation of the multicritical dynamics at a tetracritical or bicritical point in three-dimensional anisotropic antiferromagnets in an external magnetic field is performed. Although strong scaling for the two order parameters (OPs) perpendicular and parallel to the field is restored as found earlier, in the experimentally accessible region the effective dynamical exponents for the relaxation of the OPs remain different since their equal asymptotic values are not reached.
PACS: 64.60.Ht – Dynamic critical phenomena / 64.60.Kw – Multicritical points / 05.10.Cc – Renormalization group methods
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