Photoinduced oxygen transport in cobalt double-perovskite crystal EuBaCo2O5.39. (September 2021)

• Record Type: Journal Article
• Authors: Hada, Masaki; Ohmura, Satoshi; Ishikawa, Tadahiko; Saigo, Masaki; Keio, Naoya; Yajima, Wataru; Suzuki, Tatsuya; Urushihara, Daisuke; Takubo, Kou; Masaki, Yusuke; Kuwahara, Makoto; Tsuruta, Kenji; Hayashi, Yasuhiko; Matsuo, Jiro; Yokoya, Takayoshi; Onda, Ken; Shimojo, Fuyuki; Hase, Muneaki; Ishihara, Sumio; Asaka, Toru; Abe, Nobuyuki; Arima, Taka-hisa; Koshihara, Shin-ya; Okimoto, Yoichi
• Is Part Of: Applied materials today. Volume 24(2021)
• Publication Date: 2021-09
• Subjects: Double perovskite crystal -- Cobalt oxide -- Oxygen order -- Photoinduced phenomena -- Time-resolved electron diffraction; Materials science -- Periodicals; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1016/j.apmt.2021.101167
• Languages: English
• ISSNs: 2352-9407

Abstract

Highlights: Photoinduced oxide ion motions observed in EuBaCo2 O5.39 crystals. Time-resolved electron diffraction combined with transient optical measurements. The oxide ion motions occurring within a few picoseconds. Charge transfer and Jahn–Teller effect driving the oxide ion motions. Abstract: Understanding and controlling atomic motions in solid are essential in ionic materials, such as ion conductors, electrolyte and electrodes of batteries, and gas separators. Although photoinduced proton transport in solid materials has been demonstrated, photoinduced transport of heavier ions, such as the oxide ion, in solid materials remains entirely elusive. Herein, we apply ultrafast time-resolved electron diffraction to observe the large displacement of oxide ions in a strongly correlated material, EuBaCo2 O5.39, under near-ultraviolet photoexcitation at room temperature. The mechanism of the photoinduced transport of oxide ions is revealed via the combination of ultrafast optical spectroscopy and density functional theory calculations. Our findings show that photoexcitation induces ionic motions in a ceramic crystal at room temperature through the charge transfer that strongly couples with large ionic displacement under the nonequilibrium condition. Graphical abstract: Image, graphical abstract