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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 )

Journal Article · · Physical Review B
 [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)
+ Show Author Affiliations

In hybrid improper ferroelectric systems, polarization arises from the onset of successive nonpolar lattice modes. In this work, 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 T-T similar to 400 K for Ca3Mn2O7 (and continuously for X = Ti) and the rotation mode amplitude is suppressed at much higher temperatures T-R similar to 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 indicate that the Ca3Mn2O7 system provides a platform for strain engineering of ferroelectric properties in film-based systems with substrate-induced strain.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0012704; GF02-07ER46382; AC02-05CH11231; AC02-06CH11357
OSTI ID:
1550794
Alternate ID(s):
OSTI ID: 1546312; OSTI ID: 1560054
Report Number(s):
BNL-211931-2019-JAAM; PRBMDO
Journal Information:
Physical Review B, Vol. 99, Issue 22; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (1)

Interplay of spin, lattice, vibration, and charge degrees of freedom: Magneto‐dielectricity in Ca 3 Mn 2 O 7 journal January 2020

Figures / Tables (42)

Table I(p. 17)table Table I
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Fig. S1(p. 37)figure Fig. S1
Table S1(p. 38)table Table S1
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Table S11(p. 66)table Table S11
Fig. S22(p. 67)figure Fig. S22

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