Hole-induced electronic and optical transitions in epitaxial thin films
Journal Article
·
· Physical Review Materials
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
We have investigated the electronic and optical properties of epitaxial La1-xSrxFeO3 for 0 ≤ x ≤ 1 prepared by molecular-beam epitaxy. Core-level and valence-band x-ray photoemission features monotonically shift to lower binding energy with increasing x, indicating downward movement of the Fermi level toward the valence-band maximum. Combining valence-band photoemission and O K-edge x-ray absorption data, we map the evolution of the occupied and unoccupied bands and observe a narrowing of the gap, along with a transfer of state density from just below to just above the Fermi level as a result of hole doping. In-plane transport measurements confirm that the material becomes a p-type semiconductor at lower doping levels and exhibits a conversion from semiconducting to metallic behavior at x = 1. As a result, low-energy optical transitions revealed by spectroscopic ellipsometry are explained based on insight from theoretical densities of states and first-principles calculations of optical absorption spectra.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC02-05CH11231; AC02-06CH11357
- OSTI ID:
- 1510080
- Alternate ID(s):
- OSTI ID: 1501850
OSTI ID: 1493381
- Journal Information:
- Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 2 Vol. 3; ISSN PRMHAR; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Brownmillerite phase formation and evolution in epitaxial strontium ferrite heterostructures
|
journal | June 2019 |
Confined polaronic transport in (LaFeO 3 ) n /(SrFeO 3 ) 1 superlattices
|
journal | July 2019 |
Similar Records
Hole-induced electronic and optical transitions in epitaxial thin films
Interconversion of intrinsic defects in
Interconversion of intrinsic defects in
Journal Article
·
Thu Jan 31 23:00:00 EST 2019
· Physical Review Materials
·
OSTI ID:1501850
Interconversion of intrinsic defects in
Journal Article
·
Fri Jun 01 00:00:00 EDT 2018
· Physical Review B
·
OSTI ID:1455258
Interconversion of intrinsic defects in
Journal Article
·
Fri Jun 01 00:00:00 EDT 2018
· Physical Review B
·
OSTI ID:1485327