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This content will become publicly available on January 19, 2019

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

Here, we report a single crystal neutron and x-ray diffraction study of the hybrid improper multiferroic Ca 3Mn 1.9Ti 0.1O 7 (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 MnO 6 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 0.04μ B/Mn site, despite a substantial out-of-plane tilt of the MnO 6 octahedra.
Authors:
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)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-07ER46382
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1465064
Alternate Identifier(s):
OSTI ID: 1417519