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This content will become publicly available on November 11, 2017

Title: Contradictory nature of Co doping in ferroelectric BaTiO3

The growth of Co-substituted BaTiO3 (BTO) films on Ge(001) substrates by molecular beam epitaxy is demonstrated in this paper. Energy-dispersive x-ray spectroscopy and transmission electron microscopy images confirm the uniform Co distribution. However, no evidence of magnetic ordering is observed in samples grown for Co concentrations between 2% and 40%. Piezoresponse force microscopy measurements show that a 5% Co-substituted BTO sample exhibits ferroelectric behavior. First-principles calculations indicate that while Co atoms couple ferromagnetically in the absence of oxygen vacancies, the occurrence of oxygen vacancies leads to locally antiferromagnetically coupled complexes with relatively strong spin coupling. Finally, the presence of a significant amount of oxygen vacancies is suggested by x-ray photoelectron spectroscopy measurements.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [1] ;  [4] ;  [3] ;  [5] ;  [1]
  1. Univ. of Texas, Austin, TX (United States). Dept. of Physics
  2. Soochow Univ., Suzhou (China). Dept. of Physics. Jiangsu Key Lab. of Thin Films
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
  4. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program/Mechanical Engineering
  5. Arizona State Univ., Tempe, AZ (United States). Dept. of Physics
  6. IBM Almaden Research Center, San Jose, CA (United States)
Publication Date:
OSTI Identifier:
1343533
Grant/Contract Number:
AC05-00OR22725; FA9550-12-10494; 11104194
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Texas, Austin, TX (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Air Force Office of Scientific Research (AFOSR) (United States); National Natural Science Foundation of China (NSFC)
Contributing Orgs:
IBM Almaden Research Center, San Jose, CA (United States); Soochow Univ., Suzhou (China); Arizona State Univ., Tempe, AZ (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ferroelectrics; piezoresponse force microscopy; DFT