Spin-dependent polaron formation dynamics in Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$ probed by femtosecond pump-probe spectroscopy

Abstract

We present a femtosecond optical pump-probe study of the multiferroic manganite Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$. The optical response of the material at pump energies of 1.55 and 3.1 eV is dominated by the $d$-$d$ and $p$-$d$ transitions of the Mn${}^{3+}$ ions. The relaxation of photoexcited electrons includes the relaxation of the Jahn-Teller distortion and polaron trapping at Mn${}^{2+}$ and Mn${}^{4+}$ sites. Ultrafast switching of superexchange interactions due to modulated $e_g$ orbital occupancy creates a localized spin excitation, which then decays on a time scale of tens of picoseconds at low temperatures. The localized spin state decay appears as a tremendous increase in the amplitude of the photoinduced reflectance, due to the strong coupling of optical transitions to the spin-spin correlations in the crystalline $a$-$b$ plane.

References in corpus (6)

• Electrodynamics of Correlated Electron Materials
• Colossal magnon-phonon coupling in multiferroic Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$
• Ultrafast carrier dynamics and radiative recombination in multiferroic BiFeO${}_3$
• Terahertz spectroscopy of electromagnons in Eu_{1-x}Y_xMnO_3
• Detection of coherent magnons via ultrafast pump-probe reflectance spectroscopy in multiferroic Ba0.6Sr1.4Zn2Fe12O22
• Hybridization and superconducting gaps in heavy-fermion superconductor PuCoGa5 probed via the dynamics of photoinduced quasiparticles

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