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

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

2001-10-24

arxiv.org/abs/cond-mat/0110507v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1143/JPSJ.71.189

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.

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