Super-Atom Representation of High-TC Superconductivity

TL;DR

This paper presents a novel RVB-based real-space model for high-temperature superconductivity, emphasizing the coexistence of two condensates and linking it to BCS theory, with implications for electron-doped cuprates.

Contribution

It introduces a super-atom RVB approach that models HTS as coexisting Bose-Einstein condensates, offering new insights into electron-doped cuprates.

Findings

Demonstrates formation of real-space Cooper pairs in HTS

Shows coexistence of two Bose-Einstein condensates at Tc

Connects RVB approach to BCS formulation

Abstract

A resonating valence bond RVB approach is taken to demonstrate formation of real-space Cooper pairs and High-TC superconductivity HTS. Non-adiabatic coupling between holes aggregates (super-atoms) and undoped anti-ferromagnet cause virtual excitations in either system due to inter-system coupling. HTS is said to reflect cooperative co-existence of two Bose-Einstein condensates in terms of one real-space Cooper pair condensate, and a second magnon condensate, which form at the same critical temperature. TC is formulated in terms of the super-exchange interaction. Connection is made to an equivalent real-space BCS formulation of HTS. Novel perspectives on the HTS in the electron-doped Sr1-xLaxCuO2 and Nd2-xCexCuO4 emerge.