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Title: Nature of the structural symmetries associated with hybrid improper ferroelectricity in C a 3 X 2 O 7 ( X = Mn and Ti )

Abstract

In hybrid improper ferroelectric systems, polarization arises from the onset of successive nonpolar lattice modes. Here, measurements and modeling were performed to determine the spatial symmetries of the phases involved in the transitions to these modes. Structural and optical measurements reveal that the tilt and rotation distortions of the MnO 6 or TiO 6 polyhedra relative to the high symmetry phases driving ferroelectricity in the hybrid improper Ca 3X 2O 7 system (X = Mn and Ti) condense at different temperatures. The tilt angle vanishes abruptly at T T ~ 400 K for Ca 3Mn 2O 7 (and continuously for X = Ti ) and the rotation mode amplitude is suppressed at much higher temperatures T R ~ 1060 K. Moreover, Raman measurements in Ca 3Mn 2O 7 under isotropic pressure reveal that the polyhedral tilts can be suppressed by very low pressures (between 1.4 and 2.3 GPa) indicating their softness. These results suggest that the Ca 3Mn 2O 7 system provides a platform for strain engineering of ferroelectric properties in film-based systems with substrate-induced strain.

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [5];  [6];  [6];  [6];  [7]
  1. New Jersey Inst. of Technology, Newark, NJ (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Univ. of Illinois, Chicago, IL (United States)
  5. UChicago, LLC., Argonne, IL (United States)
  6. Rutgers Univ., Piscataway, NJ (United States)
  7. New Jersey Inst. of Technology, Newark, NJ (United States); Rutgers Univ., Piscataway, NJ (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1550794
Alternate Identifier(s):
OSTI ID: 1546312
Report Number(s):
BNL-211931-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704; GF02-07ER46382; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Liu, S., Zhang, H., Ghose, S., Balasubramanian, M., Liu, Zhenxian, Wang, S. G., Chen, Y. -S., Gao, B., Kim, Jaewook, Cheong, S. -W., and Tyson, T. A. Nature of the structural symmetries associated with hybrid improper ferroelectricity in Ca3X2O7(X=Mnand Ti). United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.224105.
Liu, S., Zhang, H., Ghose, S., Balasubramanian, M., Liu, Zhenxian, Wang, S. G., Chen, Y. -S., Gao, B., Kim, Jaewook, Cheong, S. -W., & Tyson, T. A. Nature of the structural symmetries associated with hybrid improper ferroelectricity in Ca3X2O7(X=Mnand Ti). United States. doi:10.1103/PhysRevB.99.224105.
Liu, S., Zhang, H., Ghose, S., Balasubramanian, M., Liu, Zhenxian, Wang, S. G., Chen, Y. -S., Gao, B., Kim, Jaewook, Cheong, S. -W., and Tyson, T. A. Thu . "Nature of the structural symmetries associated with hybrid improper ferroelectricity in Ca3X2O7(X=Mnand Ti)". United States. doi:10.1103/PhysRevB.99.224105.
@article{osti_1550794,
title = {Nature of the structural symmetries associated with hybrid improper ferroelectricity in Ca3X2O7(X=Mnand Ti)},
author = {Liu, S. and Zhang, H. and Ghose, S. and Balasubramanian, M. and Liu, Zhenxian and Wang, S. G. and Chen, Y. -S. and Gao, B. and Kim, Jaewook and Cheong, S. -W. and Tyson, T. A.},
abstractNote = {In hybrid improper ferroelectric systems, polarization arises from the onset of successive nonpolar lattice modes. Here, measurements and modeling were performed to determine the spatial symmetries of the phases involved in the transitions to these modes. Structural and optical measurements reveal that the tilt and rotation distortions of the MnO6 or TiO6 polyhedra relative to the high symmetry phases driving ferroelectricity in the hybrid improper Ca3X2O7 system (X = Mn and Ti) condense at different temperatures. The tilt angle vanishes abruptly at TT ~ 400 K for Ca3Mn2O7 (and continuously for X = Ti ) and the rotation mode amplitude is suppressed at much higher temperatures TR ~ 1060 K. Moreover, Raman measurements in Ca3Mn2O7 under isotropic pressure reveal that the polyhedral tilts can be suppressed by very low pressures (between 1.4 and 2.3 GPa) indicating their softness. These results suggest that the Ca3Mn2O7 system provides a platform for strain engineering of ferroelectric properties in film-based systems with substrate-induced strain.},
doi = {10.1103/PhysRevB.99.224105},
journal = {Physical Review B},
number = 22,
volume = 99,
place = {United States},
year = {2019},
month = {6}
}

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