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25 April 2024 |
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Global formation of topological defects in the multiferroic hexagonal manganites | | Q. N. Meier
; M. Lilienblum
; S. M. Griffin
; K. Conder
; E. Pomjakushina
; Z. Yan
; E. Bourret
; D. Meier
; F. Lichtenberg
; E. K. H. Salje
; N. A. Spaldin
; M. Fiebig
; A. Cano
; | | Date: |
24 Mar 2017 | | Abstract: | The spontaneous transformations associated with symmetry-breaking phase
transitions generate domain structures and defects that may be topological in
nature. The formation of these defects can be described according to the
Kibble-Zurek mechanism, which provides a generic relation that applies from
cosmological to interatomic lengthscales. Its verification is challenging,
however, in particular at the cosmological scale where experiments are
impractical. While it has been demonstrated for selected condensed-matter
systems, major questions remain regarding e.g. its degree of universality. Here
we develop a global Kibble-Zurek picture from the condensed-matter level. We
show theoretically that a transition between two fluctuation regimes (Ginzburg
and mean-field) can lead to an intermediate region with reversed scaling, and
we verify experimentally this behavior for the structural transition in the
series of multiferroic hexagonal manganites. Trends across the series allow us
to identify additional intrinsic features of the defect formation beyond the
original Kibble-Zurek paradigm. | | Source: | arXiv, 1703.8321 | | Services: | Forum | Review | PDF | Favorites | |
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