Abstract
Polar phonon modes associated with room temperature ferroelectricity are observed in SrTiO3 single crystals irradiated with Ti ions. Quantitative strain analysis reveals that irradiation-induced out-of-plane strain drives the centrosymmetric cubic SrTiO3 to a tetragonal-like structure in the maximum damaged region. Energy transfer from ions to electrons during ion irradiation yields defects in SrTiO3 that also plays an important role for the room temperature ferroelectricity. Different from thin film techniques, the ferroelectricity in the ion irradiated SrTiO3 can occur for much larger thicknesses, depending on the energy and type of ion.
| Original language | English |
|---|---|
| Article number | 355405 |
| Journal | Journal of Physics Condensed Matter |
| Volume | 32 |
| Issue number | 35 |
| DOIs | |
| State | Published - Aug 19 2020 |
Funding
FZ would like to acknowledge the help from Dr Aurelien Debelle for the x-ray measurements and strain analysis. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy of Sciences, Materials Sciences and Engineering Division under Contract DE-AC05-00OR22725. HX was supported by the University of Tennessee Governor's Chair program for RBS/C. The lab x-ray experiment was conducted at the Center for NanophaseMaterials Sciences, which is a DOE Office of Science User Facility.
| Funders | Funder number |
|---|---|
| University of Tennessee Governor | |
| U.S. Department of Energy | |
| Office of Science | |
| Basic Energy Sciences | |
| Division of Materials Sciences and Engineering | DE-AC05-00OR22725 |
Keywords
- Raman
- SrTiO3
- ion irradiation
- x-ray diffraction