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Title: Global Formation of Topological Defects in the Multiferroic Hexagonal Manganites

Journal Article · · Physical Review. X

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 length scales. 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.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; p504
OSTI ID:
1400434
Alternate ID(s):
OSTI ID: 1421830
Journal Information:
Physical Review. X, Journal Name: Physical Review. X Vol. 7 Journal Issue: 4; ISSN 2160-3308
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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Cited By (3)

Immobile defects in ferroelastic walls: Wall nucleation at defect sites journal February 2018
Frequency dependent polarisation switching in h-ErMnO 3 journal April 2018
Nanoscale topological defects and improper ferroelectric domains in multiferroic barium hexaferrite nanocrystals journal August 2019

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