OPTICAL GAP OF STRONTIUM TITANATE (DEVIATION FROM URBACH TAIL BEHAVIOR)
OPTICAL GAP OF STRONTIUM TITANATE (DEVIATION FROM URBACH TAIL BEHAVIOR)
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DOI：
10.1103/physrevlett.25.1298
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发表时间：
1970-01-01
影响因子：
8.6
通讯作者：
FROVA, A
中科院分区：
文献类型：
--
作者：
CAPIZZI, M;FROVA, A
在液氮温度附近，SrTiO3在基频边以下的吸收表现出振荡行为，并提出了一种间接跃迁的解释，该跃迁的中心在3.27eV附近，涉及51meV的LO声子.没有激子效应的证据。第一个直接跃迁可能是X5 ′→ X3，位于13.46eV。增宽效应掩盖了在较高温度下的间接结构，其中吸收曲线逐渐演变成正常的Urbach拖尾。
The absorption of SrTi O 3 below the fundamental edge shows, near liquid-nitrogen temperature, an oscillatory behavior, for which an explanation is proposed in terms of indirect transitions Γ 15→ X 3, centered around 3.27 eV and involving a 51-meV LO phonon. There is no evidence of excitonic effects. The first direct transition is probably X 5′→ X 3 and is located at∼ 3.46 eV. Broadening effects mask the indirect structure at higher temperatures where the absorption curves gradually evolve into normal Urbach tailing.