Confined polaronic transport in (LaFeO3 )n/(SrFeO3)1 superlattices

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.

doi:10.1063/1.5110190

Title: Confined polaronic transport in (LaFeO₃ )_n/(SrFeO₃)₁ superlattices

Journal Article · Wed Jul 31 00:00:00 EDT 2019 · APL Materials

DOI:https://doi.org/10.1063/1.5110190· OSTI ID:1558613

Chang, Seo Hyoung ^[1]; Kim, Seong Keun ^[2];

^[3]; Dong, Yongqi ^[4]; Folkman, Chad M. ^[5]; Jeong, Da Woon ^[6];

^[7];

^[8];

^[5];

^[5]

Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Chung-Ang Univ., Seoul (South Korea). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Korea Inst. of Science and Technology, Seoul (South Korea)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Sungkyunkwan Univ., Suwon (South Korea)
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Science and Technology of China, Hefei (China)
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Seoul National Univ. (South Korea)
Sungkyunkwan Univ., Suwon (South Korea)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: 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); USDOE

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1558613

Alternate ID(s):: OSTI ID: 1545914; OSTI ID: 1822104

Journal Information:: APL Materials, Vol. 7, Issue 7; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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