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Title: Quasilocal plasmons in the insulator-metal transition in the Mott-type perovskites Eu0.3Ba0.7Ti1-xNbxO3
Authors: Chaudhuri, A. 
Rubi, K. 
Asmara, T. C. 
Chi, X. 
Yu, X. J. 
Mahendiran, R. 
Rusydi, A. 
Issue Date: 5-Oct-2018
Publisher: American Physical Society
Citation: Chaudhuri, A., Rubi, K., Asmara, T. C., Chi, X., Yu, X. J., Mahendiran, R., Rusydi, A. (2018-10-05). Quasilocal plasmons in the insulator-metal transition in the Mott-type perovskites Eu0.3Ba0.7Ti1-xNbxO3. PHYSICAL REVIEW B 98 (16). ScholarBank@NUS Repository.
Abstract: Tunable plasmons in the infrared energy range are of critical importance in designing novel plasmonic materials with fascinating uses in various solid-state applications, such as plasmonics, transformation optics, and biochemical sensors. Perovskite oxides are promising building-block materials for plasmon generation because they have wide and tunable band gaps as well as the possibility of having low plasmonic loss. Here, using a combination of high-resolution spectroscopic ellipsometry, x-ray-absorption spectroscopy both at TiL3,2 and O K edges, and transport measurements, we report a highly tunable quasilocal plasmon at room temperature in the long-wavelength infrared range (<1 eV) in a Mott-type insulator Eu0.30Ba0.70Ti(1-x)NbxO3(0?x?0.10). Interestingly, the quasilocal plasmon, which can be controlled by varying Nb substitution, is originated by the effect of screening of Eu 4f electrons accompanied by band modulation that alters the relative strength of charge-transfer and Mott-transition interactions, yielding an insulator-metal transition. These quasilocal plasmons in Mott-type perovskites may open a strategy for device fabrication in the infrared-to-visible region. © 2018 American Physical Society.
ISSN: 24699950
Appears in Collections:Staff Publications

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