Charge kinks as Raman scatterers in quarter-filled ladders

Abstract

Charge kinks are considered as fundamental excitations in quarter-filled charge-ordered ladders. The strength of the coupling of the kinks to the three-dimensional lattice depends on their energy. The integrated intensity of Raman scattering by kink-antikink pairs is proportional to ${\varphi }^5$ or ${\varphi }^4,$ where $\varphi$ is the order parameter. The exponent is determined by the system parameters and by the strength of the electron-phonon coupling.

To be published in Phys. Rev.B (june 2001)