Soliton excitations in halogen-bridged mixed-valence binuclear metal complexes

Abstract

Motivated by recent stimulative observations in halogen (X)-bridged binuclear transition-metal (M) complexes, which are referred to as MMX chains, we study solitons in a one-dimensional three-quarter-filled charge-density-wave system with both intrasite and intersite electron-lattice couplings. Two distinct ground states of MMX chains are reproduced and the soliton excitations on them are compared. In the weak-coupling region, all the solitons are degenerate to each other and are uniquely scaled by the band gap, whereas in the strong-coupling region, they behave differently deviating from the scenario in the continuum limit. The soliton masses are calculated and compared with those for conventional mononuclear MX chains.

9 pages, 10 figures embedded, to be published in J. Phys. Soc. Jpn. 71, No. 1 (2002)

References in corpus (3)

• Characterization of halogen-bridged binuclear metal complexes as hybridized two-band materials
• Quantum and Thermal Phase Transitions of Halogen-Bridged Binuclear Transition-Metal Complexes
• Pressure-induced phase transitions of halogen-bridged binuclear metal complexes R_4[Pt_2(P_2O_5H_2)_4X]nH_2O

Cited by in corpus (5)

• Nonlinear lattice relaxation of photoexcited diplatinum-halide chain compounds
• Soliton-induced optical absorption of halogen-bridged mixed-valence binuclear metal complexes
• Photoproduction of spin and charge carriers in halogen-bridged binuclear platinum chain complexes
• Photoinduced Absorption Spectra of Halogen-Bridged Binuclear Metal Complexes: Possible Contrast between R_4_[Pt_2_(P_2_O_5_H_2_)_4_X]nH_2_O and Pt_2_(CH_3_CS_2_)_4_I
• Photoinduced infrared absorption of quasi-one-dimensional halogen-bridged binuclear transition-metal complexes