Stripes, Carriers, Pseudogap, and Superconductivity in the Cuprates

TL;DR

This paper models the electronic structure of high-T_c cuprates, revealing stripe formations, three carrier types, and a pairing mechanism involving quasielectrons and stripons that explains superconductivity and pseudogap phenomena.

Contribution

It introduces a novel framework with three distinct carriers and a pairing mechanism based on svivon exchange, advancing understanding of cuprate superconductivity.

Findings

Identification of three carrier types: stripons, quasielectrons, svivons

Derivation of anomalous transport properties of cuprates

Explanation of superconductivity and pseudogap phases via carrier interactions

Abstract

The electronic structure of the high-T_c cuprates is studied on the basis of both "large-U" and "small-U" orbitals. A striped structure is obtained, and three types of carriers: polaron-like "stripons" carrying charge, "quasielectrons'' carrying charge and spin, and "svivons" carrying spin and lattice distortion. Anomalous properties of the cuprates and specifically their transport properties are derived. Pairing is found to result from transitions between pair states of quasielectrons and stripons through the exchange of svivons. The pairing results in superconductivity when the stripons conduction is coherent, and in a pseudogap phase when it is not.