Ultrafast Jahn-Teller polaron dynamics in a bi-layered manganite single crystal

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• 作者：Huizhen Wang ; Dongmei Deng ; Zeyu Zhang ; Kai Xu ; Qunfeng Pan ; Xian Lin ; Long Yan ; Shixun Cao ; Zhenxiang Cheng ; Zuanming Jin and Guohong Ma
• 刊名：physica status solidi (RRL) - Rapid Research Letters
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：10
• 期：7
• 页码：558-562
• 全文大小：338K
• ISSN：1862-6270

文摘

We report the photoinduced ultrafast quasiparticle recombination dynamics of colossal magnetoresistance single crystal La_1.2Sr_1.8Mn₂O₇ by using femtosecond time-resolved reflection spectroscopy in a wide range of temperatures. Here, we find the transient reflectivity change ΔR exhibits a competition process of a fast negative component (∼ sub-picosecond) against a slow positive component (∼ nanosecond), as the sample goes from paramagnetic (PM) to ferromagnetic (FM) state with decreasing the temperature. The very fast initial decay of the photoinduced ΔR corresponds to the photoionization of the Jahn–Teller polaronic response, which is unambiguously sensitive to the coupling between electron and lattice in the PM and FM phases in La_1.2Sr_1.8Mn₂O₇ single crystal. (