Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.44: Poster
Donnerstag, 10. März 2016, 15:00–18:30, Poster D
Correlations of magnetic crystalline order in critical chiral paramagnets — •Laura Köhler, Achim Rosch, and Markus Garst — Institute for theoretical physics, University of Cologne, Cologne, Germany
The formation of magnetic long-range order in chiral magnets like MnSi or Cu3OSeO3 corresponds to
a so-called weak-crystallization process where strong interactions between critical paramagnons result in a fluctuation-induced first-order transition [1,2,3]. In these materials, the helimagnetic order and the Skyrmion lattice realize a one- and two-dimensional magnetic crystal, respectively. We explore crystalline correlations above the critical temperature Tc by considering the two-loop self-energy that involves three paramagnons with vanishing total momentum. In this case, the momenta of the paramagnons form a triangle. We discuss the importance of various triangular configuration and, in particular, equilateral triangles which are building blocks for two- as well as three-dimensional crystalline order.
M. Janoschek et al., PRB 87, 134407 (2013).
A. Bauer, M. Garst and C. Pfleiderer, PRL 110, 177207 (2013).
J. Kindervater et al., PRB 89, 180408(R) (2014).