Unconventional Continuous Structural Disorder at the Order-Disorder Phase Transition in the Hexagonal Manganites
Abstract
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 structuralmore »
- Authors:
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1530478
- Alternate Identifier(s):
- OSTI ID: 1524558
- Report Number(s):
- BNL-211732-2019-JAAM
Journal ID: ISSN 2160-3308; PRXHAE; 031001
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Published Article
- Journal Name:
- Physical Review. X
- Additional Journal Information:
- Journal Name: Physical Review. X Journal Volume: 9 Journal Issue: 3; Journal ID: ISSN 2160-3308
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Skjærvø, Sandra H., Meier, Quintin N., Feygenson, Mikhail, Spaldin, Nicola A., Billinge, Simon J. L., Bozin, Emil S., and Selbach, Sverre M. Unconventional Continuous Structural Disorder at the Order-Disorder Phase Transition in the Hexagonal Manganites. United States: N. p., 2019.
Web. doi:10.1103/PhysRevX.9.031001.
Skjærvø, Sandra H., Meier, Quintin N., Feygenson, Mikhail, Spaldin, Nicola A., Billinge, Simon J. L., Bozin, Emil S., & Selbach, Sverre M. Unconventional Continuous Structural Disorder at the Order-Disorder Phase Transition in the Hexagonal Manganites. United States. https://doi.org/10.1103/PhysRevX.9.031001
Skjærvø, Sandra H., Meier, Quintin N., Feygenson, Mikhail, Spaldin, Nicola A., Billinge, Simon J. L., Bozin, Emil S., and Selbach, Sverre M. Mon .
"Unconventional Continuous Structural Disorder at the Order-Disorder Phase Transition in the Hexagonal Manganites". United States. https://doi.org/10.1103/PhysRevX.9.031001.
@article{osti_1530478,
title = {Unconventional Continuous Structural Disorder at the Order-Disorder Phase Transition in the Hexagonal Manganites},
author = {Skjærvø, Sandra H. and Meier, Quintin N. and Feygenson, Mikhail and Spaldin, Nicola A. and Billinge, Simon J. L. and Bozin, Emil S. and Selbach, Sverre M.},
abstractNote = {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.},
doi = {10.1103/PhysRevX.9.031001},
journal = {Physical Review. X},
number = 3,
volume = 9,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 2019},
month = {Mon Jul 01 00:00:00 EDT 2019}
}
https://doi.org/10.1103/PhysRevX.9.031001
Web of Science
Figures / Tables:
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