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Title: Soft antiphase tilt of oxygen octahedra in the hybrid improper multiferroic Ca 3 Mn 1.9 Ti 0.1 O 7

Journal Article · · Physical Review B
ORCiD logo [1];  [2];  [2]; ORCiD logo [1];  [3];  [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [4];  [4];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Renmin Univ. of China, Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Fudan Univ., Shanghai (China); Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
  4. Rutgers Univ., Piscataway, NJ (United States)

Here, we report a single crystal neutron and x-ray diffraction study of the hybrid improper multiferroic Ca3Mn1.9Ti0.1O7 (CMTO), a prototypical system where the electric polarization arises from the condensation of two lattice distortion modes. With increasing temperature (T), the out-of-plane, antiphase tilt of MnO6 decreases in amplitude while the in-plane, in-phase rotation remains robust and experiences abrupt changes across the first-order structural transition. Application of hydrostatic pressure (P) to CMTO at room temperature shows a similar effect. The consistent behavior under both T and P reveals the softness of antiphase tilt and highlights the role of the partially occupied d orbital of the transition-metal ions in determining the stability of the octahedral distortion. Polarized neutron analysis indicates the symmetry-allowed canted ferromagnetic moment is less than the 0.04μB/Mn site, despite a substantial out-of-plane tilt of the MnO6 octahedra.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; FG02-07ER46382
OSTI ID:
1465064
Alternate ID(s):
OSTI ID: 1417519
Journal Information:
Physical Review B, Vol. 97, Issue 4; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (6)

Microstructure and ferroelectric properties of (Ca1−xSrx)3(Ti1−yMny)2O7 ceramics journal December 2018
Mapping the structural transitions controlled by the trilinear coupling in Ca 3- x Sr x Ti 2 O 7 journal June 2019
Enhanced hybrid improper ferroelectricity in Sr 3− x Ba x Sn 2 O 7 ceramics with a Ruddlesden–Popper (R–P) structure journal January 2020
Lattice dynamics of the hybrid improper ferroelectrics ( Ca , Sr ) 3 Ti 2 O 7 journal December 2019
Nature of the structural symmetries associated with hybrid improper ferroelectricity in C a 3 X 2 O 7 ( X = Mn and Ti ) journal June 2019
Mapping the structural transitions controlled by the trilinear coupling in Ca3-xSrxTi2O7 text January 2019

Figures / Tables (5)