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Title: Unconventional Continuous Structural Disorder at the Order-Disorder Phase Transition in the Hexagonal Manganites

Journal Article · · Physical Review. X

The improper ferroelectricity in YMnO3 and other related multiferroic hexagonal manganites are known to cause topologically protected ferroelectric domains that give rise to rich and diverse physical phenomena. The local structure and structural coherence across the ferroelectric transition,however, were previously not well understood. Here we reveal the evolution of the local structure with temperature in YMnO3 using neutron total scattering techniques, and interpret them with the help of first-principles calculations and with a first-principles-based effective Hamiltonian. The results show that, at room temperature, the local and average structures are consistent with the established ferroelectric P63cm symmetry. On heating, both local and average structural analyses show striking anomalies from ~800K up to the Curie temperature and signatures of a locally more preserved structure than on average, consistent with increasing fluctuations of the order parameter angle. These fluctuations result in an unusual local symmetry lowering into a continuum of structures on heating. This local symmetry breaking persists into the high-symmetry non-polar phase,constituting an unconventional type of order-disorder transition, and we pinpoint it as the reason for the anomalous behaviour near the phase transition. The hidden disorder revealed in YMnO3 by total scattering is expected to find analogies in other materials with structural frustration or characteristic energy barriers of different magnitudes.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1530478
Alternate ID(s):
OSTI ID: 1524558
Report Number(s):
BNL-211732-2019-JAAM; PRXHAE; 031001
Journal Information:
Physical Review. X, Journal Name: Physical Review. X Vol. 9 Journal Issue: 3; ISSN 2160-3308
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Figures / Tables (7)


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