Photoinduced Oxygen Transport in Cobalt Double-Perovskite Crystal EuBaCo2O5.39
Photoinduced Oxygen Transport in Cobalt Double-Perovskite Crystal EuBaCo2O5.39
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钴双钙钛矿晶体 EuBaCo2O5.39 中的光诱导氧传输
DOI：
10.1016/j.apmt.2021.101167
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
S. Koshihara
中科院分区：
文献类型：
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作者：
M. Hada;S. Ohmura;T. Ishikawa;M. Saigo;N. Keio;W. Yajima;T. Suzuki;D. Urushihara;K. Takubo;Y. Masaki;M. Kuwahara;K. Tsuruta;Y. Hayashi;J. Matsuo;T. Yokoya;K. Onda;F. Shimojo;M. Hase;S. Ishihara;T. Asaka;N. Abe;T. Arima;S. Koshihara
了解和控制固体中的原子运动在离子材料中是必不可少的，例如离子导体、电池的电解液和电极以及气体分离器。虽然已经证明了固体材料中的光致质子传输，但较重的离子，如氧化物离子，在固体材料中的光致传输仍然是完全难以捉摸的。在这里，我们用超快时间分辨电子衍射观察到了强关联材料EuBaCo2O5.39在室温下的近紫外光激发下氧离子的大位移。结合超快光谱和密度泛函理论计算，揭示了氧离子的光致输运机理。我们的发现表明，在室温下，光激发通过与非平衡条件下的大离子位移强烈耦合的电荷转移，在陶瓷晶体中诱导离子运动。
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, EuBaCo2O5.39, 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.