Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/168577
Title: Origin of quasilocal plasmons in Nb-substituted EuTiO3
Authors: Chaudhuri, A. 
Midya, A. 
Rubi, K.
Chi, X. 
Asmara, T. C. 
Yu, X. J. 
Mahendiran, R. 
Rusydi, A. 
Issue Date: 29-Aug-2019
Publisher: American Physical Society
Citation: Chaudhuri, A., Midya, A., Rubi, K., Chi, X., Asmara, T. C., Yu, X. J., Mahendiran, R., Rusydi, A. (2019-08-29). Origin of quasilocal plasmons in Nb-substituted EuTiO3. PHYSICAL REVIEW B 100 (8). ScholarBank@NUS Repository.
Abstract: Doped perovskite oxides are promising "material building blocks" for achieving tunable and intrinsically low-loss plasmonic features in the visible- to near-infrared range, which are unlikely to obtain from conventional plasmonic materials. Here, using a combination of spectroscopic ellipsometry, soft x-ray absorption, x-ray photoemission, and ultraviolet photoemission spectroscopic measurements we observe an unconventional tunable low-loss quasilocal plasmon in the IR energy (<1 eV) range in the Nb-substituted perovskite oxide EuTiO3 (EuTi1-xNbxO3). This low-loss plasmon oscillation is formed by many-body interactions, an interplay of quasifree d1 electrons and hybridizations of Eu 4f-Ti 3d and O 2p-Ti 3d. We find that the Nb substitution at Ti site modifies the TiO6 octahedral tilting and, consequently, alters the electronic structure. Our study reveals the importance of charge, orbital, and lattice to generate plasmons in EuTi1-xNbxO3. © 2019 American Physical Society.
Source Title: PHYSICAL REVIEW B
URI: https://scholarbank.nus.edu.sg/handle/10635/168577
ISSN: 24699950
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