| Autor: |
Talbayev, Diyar, Lee, Jinho, Trugman, Stuart A., Zhang, Chenglin, Cheong, Sang-Wook, Averitt, Richard D., Taylor, Antoinette J., Prasankumar, Rohit P. |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 91, 064420 (2015) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.91.064420 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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