Optical Absorption Spectra in One-Dimensional Mixed-Valence Complexes Pt-X (X=Cl, Br, I)
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概要
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Optical absorption spectra associated with non-linear excitations in halogen-bridged mixed-valence Pt complexes Pt-X (X=Cl, Br, I) are investigated theoretically on the basis of the one-dimensional single-band Peierls-Hubbard model. The expressions for the zone-center phonon frequencies in the CDW state are derived by calculating the second order expansion coefficients of the adiabatic potential. Then, the parameters in the model Hamiltonian are determined by utilizing the observed values of the energy gap, the halogen displacement and the frequencies of the zone-center phonons. The optical absorption spectra associated with the non-linear excitations such as solitons and polarons are calculated, and the origins for the three lines of photo-induced mid-gap absorption observed in each Pt-X are assigned as follows. In Pt-Cl all the three lines are due to polarons. In Pt-Br and Pt-I, on the other hand, two of the three lines are due to polarons, but the remaining one is due to charged-solitons.
- 社団法人日本物理学会の論文
- 1995-06-15
著者
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SUZUKI Naoshi
Department of Material Physics,Faculty of Engineering Science,Osaka University
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Suzuki Naoshi
Department Of Material Phsics Faculty Of Engineering Science Osaka University
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TAGAWA Yukio
Department of Material Physics,Faculty of Engineering Science,Osaka University
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Tagawa Yukio
Department Of Material Physics Faculty Of Engineering Science Osaka University
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