Quasiparticle Relaxation Dynamics in Two Distinct Gap Structures: La₀.₆₇Ca₀.₃₃MnO₃ and LaMnO₃
Ren, Y. H. · Zhao, H. B. · L\U{fc}pke, G. · Hu, Y. F. · Li, Qi · Hong, C. S. · Hur, N. H.
Original · EN
The spin and quasiparticle relaxation dynamics in La₀.₆₇Ca₀.₃₃MnO₃ and LaMnO₃ 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 La₀.₆₇Ca₀.₃₃MnO₃, and by the temperature-independent Jahn-Teller gap in LaMnO₃. 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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