Optical spectroscopy and band gap analysis of hybrid improper ferroelectric Ca3Ti2O7
- Univ. of Tennessee, Knoxville, TN (United States)
- The State Univ. of New Jersey, Piscataway, NJ (United States)
Here, we bring together optical absorption spectroscopy, photoconductivity, and first principles calculations to reveal the electronic structure of the room temperature ferroelectric Ca3Ti2O7. The 3.94 eV direct gap in Ca3Ti2O7 is charge transfer in nature and noticeably higher than that in CaTiO3 (3.4 eV), a finding that we attribute to dimensional confinement in the n = 2 member of the Ruddlesden-Popper series. While Sr substitution introduces disorder and broadens the gap edge slightly, oxygen deficiency reduces the gap to 3.7 eV and gives rise to a broad tail that persists to much lower energies.
- Research Organization:
- Univ. of Tennessee, Knoxville, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- FG02-01ER45885
- OSTI ID:
- 1467576
- Alternate ID(s):
- OSTI ID: 1259373
- Journal Information:
- Applied Physics Letters, Vol. 108, Issue 26; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 23 works
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