Simple theory of extremely overdoped HTS

TL;DR

This paper presents a simple physical model explaining key features of high-temperature superconductivity in extremely overdoped CuO2 planes, including transition temperature, order parameter symmetry, and pseudogap behavior.

Contribution

It introduces a straightforward theoretical framework capturing the main characteristics of HTS in the overdoped regime, including pseudogap calculations and orbital paramagnetism predictions.

Findings

High transition temperature in overdoped CuO2 planes

d_{x^2 - y^2} symmetry of the superconducting order parameter

Prediction of orbital paramagnetism of preformed pairs

Abstract

We demonstrate the existence of a simple physical picture of superconductivity for extremely overdoped CuO2 planes. It possesses all characteristic features of HTS, such as a high superconducting transition temperature, the $d_{x^2 - y^2}$ symmetry of order parameter, and the coexistence of a single electron Fermi surface and a pseudogap in the normal state. Values of pseudogap are calculated for different doping levels. An orbital paramagnetism of preformed pairs is predicted.