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Anomalously broad Raman scattering spectrum due to two-magnon excitation in hexagonal YMnO3
Jun-Ichi Takahashi1, Katsumi Hagita, Keiichiro Kohn
1Japan Science and Technology Corporation (CREST), 758-65 Bibi, Chitose, Hokkaido 066-8655, Japan.
Physical Review Letters
|August 23, 2002
Abstract:
A strong and broad Raman scattering (RS) spectrum is observed from two-magnon processes in YMnO3. The spectrum is analyzed by taking account (i) the magnon-exciton interaction and (ii) the magnon-phonon coupling in the intermediate state. Anomalous broadening of the RS is attributed to the large superexchange interaction between manganite ions and subsequent modification of magnons under the presence of the exciton and phonons in the intermediate state.