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Quasiparticle Relaxation Dynamics in Two Distinct Gap Structures: La$_{0.67}$Ca$_{0.33}$MnO$_{3}$ and LaMnO$_{3}$

Y. H. Ren·H. B. Zhao·G. L\U{fc}pke·Y. F. Hu·Qi Li·C. S. Hong·N. H. Hur
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Abstract

The spin and quasiparticle relaxation dynamics in La$_{0.67}$Ca$_{0.33}$MnO$_{3}$ and LaMnO$_{3}$ single crystals and thin films is investigated as a function of temperature and magnetic field by pump-probe spectroscopy. The unusually slow spin-lattice relaxation dynamics is governed by the temperature- and magnetic field- dependent pseudogap in La$_{0.67}$Ca$_{0.33}$MnO$_{3}$, and by the temperature-independent Jahn-Teller gap in LaMnO$_{3}$. Our results show that the coupled dynamics of charge, spin and lattice is strongly correlated with the distinct gap structures in these manganites.

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Y. H. Ren, H. B. Zhao, G. L\U{fc}pke, Y. F. Hu, Qi Li, C. S. Hong, N. H. Hur. 2003-10-15. Quasiparticle Relaxation Dynamics in Two Distinct Gap Structures: La$_{0.67}$Ca$_{0.33}$MnO$_{3}$ and LaMnO$_{3}$. https://arxiv.org/abs/cond-mat/0310359

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