Optical response of films subjected to uniaxial strain
Journal Article
·
· Physical Review Materials
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Martin-Luther-Univ. Halle-Wittenberg (Germany)
- Renewable Energies Photovoltaics Laboratory, National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara (Romania)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Ulsan National Institute of Science and Technology (Korea)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); San Jose State Univ., CA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China)
The impact of single-axis lattice expansion on the optical response of BiFeO3 films is examined. Low-energy He implantation is used to tailor morphotropic phases of BiFeO3 films and study changes in their optical spectra with continuously increasing lattice expansion. He ion implantation of epitaxial rhombohedral (R)- and tetragonal (T)-like BiFeO3 films induces uniaxial out-of-plane strain that, on R-like films, eventually leads to a complete R-T phase transition. This approach allows us to provide insights into the optical response of BiFeO3 films. Strain doping of T-like films leads to a significant redshift of the optical absorption spectra that is theoretically explained by a lowering of Fe 3dt2g states. R-like films, on the other hand, show a less-pronounced sensitivity to uniaxial strain and a blueshift of about 250 meV at the strain-induced R-T transition. Here, the results demonstrate that strain doping allows a deeper examination of the optical properties of epitaxial phases that are otherwise impossible to access by standard epitaxy.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Deutsche Forschungsgemeinschaft; National Authority for Scientific Research and Innovation (ANCSI); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1607110
- Journal Information:
- Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 9 Vol. 3; ISSN PRMHAR; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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