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

Authors

Huizhen Wang, Shanghai University
Dongmei Deng, Shanghai University
Zeyu Zhang, Shanghai University
Kai Xu, Shanghai University
Qunfeng Pan, Shanghai University
Xian Lin, Shanghai University
Long Yan, Chinese Academy Of Sciences
Shixun Cao, Shanghai University
Zhenxiang Cheng, University of WollongongFollow
Zuanming Jin, Shanghai University
Guohong Ma, Shanghai UniversityFollow

RIS ID

108800

Publication Details

Wang, H., Deng, D., Zhang, Z., Xu, K., Pan, Q., Lin, X., Yan, L., Cao, S., Cheng, Z., Jin, Z. & Ma, G. (2016). Ultrafast Jahn-Teller polaron dynamics in a bi-layered manganite single crystal. Physica Status Solidi: Rapid Research Letters, 10 (7), 558-562.

Abstract

We report the photoinduced ultrafast quasiparticle recombination dynamics of colossal magnetoresistance single crystal La1.2Sr1.8Mn2O7 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 La1.2Sr1.8Mn2O7 single crystal.