Electronic excitations and optical properties of YbFe2O4 thin films

THIN SOLID FILMS

卷:673

Article

Rai, R. C.¹  Hinz, J.^1,3  Pascolini, M.¹  Sun, F.²  Zeng, H.² 

[1] SUNY Buffalo State, Dept Phys, Buffalo, NY 14222 USA

[2] Univ Buffalo SUNY, Dept Phys, Buffalo, NY 14260 USA

[3] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

关键词: Ytterbium ferrite;    Thin film;    Electronic excitation;    Band gap;   

DOI  :  10.1016/j.tsf.2019.01.035

来源: Elsevier

【 摘 要 】

We present the structural, optical properties, and electronic excitation spectra of the YbFe2O4 thin film deposited on (0001) sapphire substrates. The optical spectra of a YbFe2O4 thin film show several electronic transitions, dominated by Fe d to d on-site electronic transitions as well as O 2p to Fe 3d, Yb 6s, and Yb 5d charge-transfer electronic transitions. The direct energy band gap of YbFe2O4 has been found to be 1.40 +/- 0.01 eV at 300 K. Moreover, the electronic transitions centered at 1.75 eV and 2.41 eV exhibit strong temperature dependence with a discontinuity at similar to 190 +/- 10 K, indicating evidence for a structural instability in the system. The optical spectra of YbFe2O4 have been analyzed and also compared with that of isostructural YbFe2O4 and LuFe2O4.

【 授权许可】

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