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Title: Confined polaronic transport in (LaFeO 3 ) n/(SrFeO 3) 1 superlattices

Abstract

Functional oxide superlattices offer new and exciting possibilities for the exploration of emergent properties at the nanoscale. While the behavior of La 1-xSrxFeO 3 films has been extensively investigated at low temperatures, few studies have been carried out at high temperatures, particularly for LaFeO 3/SrFeO 3 superlattice systems. Here, we investigate the transport behavior and optical properties of (LaFeO 3) n/(SrFeO 3) 1 superlattices at 373 K and above. Using optical spectroscopy, we observe a low energy excitation at ~1 eV, attributable to charge transfer between the O 2p and Fe 3d states of the δ-doped single SrFeO 3 layer. From in-plane conductivity measurements on the superlattices, we determine activation energies that are much lower than those of alloyed samples and vary with the total number of SrFeO 3 layers. This suggests that polaronic transport is confined near the SrFeO 3 regions, permitting mobilities significantly enhanced over those in alloyed thin films.

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [5];  [6]; ORCiD logo [7];  [8]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Chung-Ang Univ., Seoul (South Korea). Dept. of Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Korea Inst. of Science and Technology, Seoul (South Korea)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Sungkyunkwan Univ., Suwon (South Korea)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Science and Technology of China, Hefei (China)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  6. Seoul National Univ. (South Korea)
  7. Sungkyunkwan Univ., Suwon (South Korea)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Research Foundation of Korea (NRF); Chung-Ang Univ. (South Korea)
OSTI Identifier:
1558613
Alternate Identifier(s):
OSTI ID: 1545914
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 7; Journal Issue: 7; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chang, Seo Hyoung, Kim, Seong Keun, Kim, Young-Min, Dong, Yongqi, Folkman, Chad M., Jeong, Da Woon, Choi, Woo Seok, Borisevich, Albina Y., Eastman, Jeffrey A., Bhattacharya, Anand, and Fong, Dillon D. Confined polaronic transport in (LaFeO3 )n/(SrFeO3)1 superlattices. United States: N. p., 2019. Web. doi:10.1063/1.5110190.
Chang, Seo Hyoung, Kim, Seong Keun, Kim, Young-Min, Dong, Yongqi, Folkman, Chad M., Jeong, Da Woon, Choi, Woo Seok, Borisevich, Albina Y., Eastman, Jeffrey A., Bhattacharya, Anand, & Fong, Dillon D. Confined polaronic transport in (LaFeO3 )n/(SrFeO3)1 superlattices. United States. doi:10.1063/1.5110190.
Chang, Seo Hyoung, Kim, Seong Keun, Kim, Young-Min, Dong, Yongqi, Folkman, Chad M., Jeong, Da Woon, Choi, Woo Seok, Borisevich, Albina Y., Eastman, Jeffrey A., Bhattacharya, Anand, and Fong, Dillon D. Wed . "Confined polaronic transport in (LaFeO3 )n/(SrFeO3)1 superlattices". United States. doi:10.1063/1.5110190. https://www.osti.gov/servlets/purl/1558613.
@article{osti_1558613,
title = {Confined polaronic transport in (LaFeO3 )n/(SrFeO3)1 superlattices},
author = {Chang, Seo Hyoung and Kim, Seong Keun and Kim, Young-Min and Dong, Yongqi and Folkman, Chad M. and Jeong, Da Woon and Choi, Woo Seok and Borisevich, Albina Y. and Eastman, Jeffrey A. and Bhattacharya, Anand and Fong, Dillon D.},
abstractNote = {Functional oxide superlattices offer new and exciting possibilities for the exploration of emergent properties at the nanoscale. While the behavior of La1-xSrxFeO3 films has been extensively investigated at low temperatures, few studies have been carried out at high temperatures, particularly for LaFeO3/SrFeO3 superlattice systems. Here, we investigate the transport behavior and optical properties of (LaFeO3)n/(SrFeO3)1 superlattices at 373 K and above. Using optical spectroscopy, we observe a low energy excitation at ~1 eV, attributable to charge transfer between the O 2p and Fe 3d states of the δ-doped single SrFeO3 layer. From in-plane conductivity measurements on the superlattices, we determine activation energies that are much lower than those of alloyed samples and vary with the total number of SrFeO3 layers. This suggests that polaronic transport is confined near the SrFeO3 regions, permitting mobilities significantly enhanced over those in alloyed thin films.},
doi = {10.1063/1.5110190},
journal = {APL Materials},
number = 7,
volume = 7,
place = {United States},
year = {2019},
month = {7}
}

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