Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 71: Correlated Electrons: Poster Session
TT 71.48: Poster
Wednesday, March 18, 2015, 15:00–18:00, Poster B
Skyrmion density correlations in critical chiral paramagnets — •Laura Köhler, Achim Rosch, and Markus Garst — Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
The interactions between critical paramagnons in chiral magnets like MnSi or Cu3OSeO3 suppress the critical temperature and, in addition, drive the transition weakly first-order. Within the resulting fluctuation-disordered regime strong correlations prevail that substantially renormalize the correlation length in quantitative agreement with Brazovski theory [1,2,3]. Within this regime, we theoretically address the correlations of the skyrmion density that can be identified with the local vector chirality of the magnetization. These correlations are expected to be particularly pronounced for finite magnetic fields close to the skyrmion crystal phase. We compute the corresponding correlation function within the Brazovski approximation with the aim to identify additional microwave resonances.
[1] M. Janoschek et al. Phys. Rev. B 87, 134407 (2013).
[2] A. Bauer et al., Phys. Rev. Lett. 110, 177207 (2013).
[3] J. Kindervater et al. Phys. Rev. B 89, 180408(R) (2014).