Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session M08: X-ray spectroscopy study of correlated electronic systems
8:00 AM–10:00 AM,
Wednesday, March 6, 2024
Room: L100I
Sponsoring
Unit:
DCMP
Chair: Trinanjan Datta, Augusta University
Abstract: M08.00002 : Investigation of the surface chemical state of SrFeO2.5 films during topotactic transition by ambient pressure X-ray photoelectron spectroscopy*
8:12 AM–8:24 AM
Presenter:
DOOYONG LEE
(Kyungpook National University)
Authors:
DOOYONG LEE
(Kyungpook National University)
HYEONYU KIM
(Kyungpook National University)
Yunzyne Kim
(Kyungpook National University)
Hyungkun Bong
(Kyungpook National University)
Sehwan Song
(Korea Research Institute of Standards & Science)
KYEONG TAE KANG
(Kyungpook National University)
BEOMGYUN JEONG
(Korea Basic Science Institute)
Woo Seok Choi
(Sungkyunkwan University)
In this study, we investigated the correlation between the surface chemistry and the topotactic transition of SFO films with different strain states. SFO films were grown on SrTiO3(001) and (LaAlO3)0.3(Sr2AlTaO6)0.7(001), LSAT substrates using the pulsed laser deposition. Structural analysis based on X-ray diffraction confirmed that both films have high crystallinity, and the SFO film grown on STO(001) showed weaker in-plane compressive strain than the film grown on LSAT(001) due to the small lattice mismatch between the film and STO substrate. We investigate the change in the surface chemical state and the corresponding electrical resistance of the films during the topotactic transition using Ambient-pressure X-ray photoelectron spectroscopy. We observed a larger surface SrO state in the film grown on the STO(001) substrate, where the phase transition occurs more slowly than the film grown on the LSAT(001) substrate. We will discuss the correlation between strain state, surface SrO, and resistance on the topotactic transition.
*RS-2023-00210625, NRF-2023R1A2C1005252, Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education (grant No. 2021R1A6C101A429).
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