Temperature-dependent photo-response in multiferroic BiFeO 3 revealed by transmission measurements
Temperature-dependent photo-response in multiferroic BiFeO 3 revealed by transmission measurements
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DOI：
10.1063/1.5081038
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发表时间：
2019-02
影响因子：
3.2
通讯作者：
F. Meggle;M. Viret;J. Kreisel;C. Kuntscher
中科院分区：
文献类型：
--
作者：
F. Meggle;M. Viret;J. Kreisel;C. Kuntscher
用光谱学方法研究了BiFeO3单晶中光致效应随温度的变化。在这里，我们报告的几个光致吸收功能，这是讨论的光致伸缩效应和解释的激子方面的观察。它们的能量位置的温度依赖性表明激子和晶格振动之间可能存在耦合。此外，有迹象表明，在温度演化的激子功能，这可能与温度诱导的磁相变BiFeO 3的异常。我们的研究结果表明光生激子与晶格和自旋自由度之间存在耦合，这可能与多铁性BiFeO3中观察到的超快光致伸缩效应有关。在这里，我们报告的几个光致吸收功能，这是讨论的光致伸缩效应和解释的激子方面的观察。它们的能量位置的温度依赖性表明激子和晶格振动之间可能存在耦合。此外，有迹象表明，在温度演化的激子功能，这可能与温度诱导的磁相变BiFeO 3的异常。我们的研究结果表明，光诱导激子和晶格和自旋自由度之间的耦合，这可能是相关的观察到的超快光致伸缩效应在多铁性BiFeO 3。
We studied the light-induced effects in BiFeO 3 single crystals as a function of temperature by means of optical spectroscopy. Here, we report the observation of several light-induced absorption features, which are discussed in terms of the photostriction effect and are interpreted in terms of excitons. The temperature dependence of their energy position suggests a possible coupling between the excitons and the lattice vibrations. Moreover, there are hints for anomalies in the temperature evolution of the excitonic features, which might be related to the temperature-induced magnetic phase transitions in BiFeO 3. Our findings suggest a coupling between light-induced excitons and the lattice and spin degrees of freedom, which might be relevant for the observed ultrafast photostriction effect in multiferroic BiFeO 3.We studied the light-induced effects in BiFeO 3 single crystals as a function of temperature by means of optical spectroscopy. Here, we report the observation of several light-induced absorption features, which are discussed in terms of the photostriction effect and are interpreted in terms of excitons. The temperature dependence of their energy position suggests a possible coupling between the excitons and the lattice vibrations. Moreover, there are hints for anomalies in the temperature evolution of the excitonic features, which might be related to the temperature-induced magnetic phase transitions in BiFeO 3. Our findings suggest a coupling between light-induced excitons and the lattice and spin degrees of freedom, which might be relevant for the observed ultrafast photostriction effect in multiferroic BiFeO 3.