Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/168574
Title: Modulation of Manganite Nanofilm Properties Mediated by Strong Influence of Strontium Titanate Excitons
Authors: Yin, Xinmao 
Tang, Chi Sin
Majidi, Muhammad Aziz 
Ren, Peng
Wang, Le
Yang, Ping 
Diao, Caozheng 
Yu, Xiaojian 
Breese, Mark B. H. 
Wee, Andrew T. S. 
Wang, Junling
Rusydi, Andrivo 
Keywords: Electron-electron and electron-hole interactions
Electronic and optical structures
Manganite thin film
Neutral and charged excitonic effects
Spectroscopic ellipsometry
Issue Date: 6-Dec-2017
Publisher: American Chemical Society
Citation: Yin, Xinmao, Tang, Chi Sin, Majidi, Muhammad Aziz, Ren, Peng, Wang, Le, Yang, Ping, Diao, Caozheng, Yu, Xiaojian, Breese, Mark B. H., Wee, Andrew T. S., Wang, Junling, Rusydi, Andrivo (2017-12-06). Modulation of Manganite Nanofilm Properties Mediated by Strong Influence of Strontium Titanate Excitons. ACS APPLIED MATERIALS & INTERFACES 10 (41) : 35563 - 35570. ScholarBank@NUS Repository.
Abstract: Hole-doped perovskite manganites have attracted much attention because of their unique optical, electronic, and magnetic properties induced by the interplay between spin, charge, orbital, and lattice degrees of freedom. Here, a comprehensive investigation of the optical, electronic, and magnetic properties of La 0.7 Sr 0.3 MnO 3 thin films on SrTiO 3 (LSMO/STO) and other substrates is conducted using a combination of temperature-dependent transport, spectroscopic ellipsometry, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism. A significant difference in the optical property of LSMO/STO that occurs even in thick (87.2 nm) LSMO/STO from that of LSMO on other substrates is discovered. Several excitonic features are observed in thin film nanostructure LSMO/STO at -4 eV, which could be attributed to the formation of anomalous charged excitonic complexes. On the basis of the spectral weight transfer analysis, anomalous excitonic effects from STO strengthen the electronic correlation in LSMO films. This results in the occurrence of optical spectral changes related to the intrinsic Mott-Hubbard properties in manganites. We find that while lattice strain from the substrate influences the optical properties of the LSMO thin films, the coexistence of strong electron-electron (e-e) and electron-hole (e-h) interactions which leads to the resonant excitonic effects from the substrate plays a much more significant role. Our result shows that the onset of anomalous excitonic dynamics in manganite oxides may potentially generate new approaches in manipulating exciton-based optoelectronic applications. © Copyright 2017 American Chemical Society.
Source Title: ACS APPLIED MATERIALS & INTERFACES
URI: https://scholarbank.nus.edu.sg/handle/10635/168574
ISSN: 19448244
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