LOCAL POLARIZATION, ELECTRON STRIPE, AND HIGH-Tc SUPERCONDUCTIVITY IN LAYERED CUPRATES

Abstract

We examine the possibility of high-Tc 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 CuO 2 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 Tc around 100 K can be realized, due to the enhancement of the coupling constant.

Electronic vibrons and possible mechanism for high-temperature superconductivity

“…This condition corresponds to solids with intermediate electron-phonon coupling. The mechanism for the superconductivity described here is similar to the one proposed recently by Kuwata [27] who has investigated the possibility of Cooper pairing due to localized charge oscillations along the stripes. When stripes are split into strings, such charge oscillations are transformed into electronic vibrons described in the present paper.…”