Local polarization, electron stripe, and high-Tc superconductivity in layered cuprates

We examine the possibility of high-T-c superconductivity mediated by the elementary excitation of an electron stripe which is realized by neutralizing local polarization mainly caused by the c-displacement of ions on the CuO2 plane. Under the translation invariance of the electronic state of the neutralization charges, it is found that both itinerant and localized electrons and/or holes can coexist in the stripe phase. If the frequency of the localized charge oscillation tends to soften along the stripe direction, superconductivity with T-c around 100 K can be realized, due to the enhancement of the coupling constant.