Enhanced Superconductivity in Sr2CuO4-v

TL;DR

This paper reviews the enhanced superconductivity in Sr2CuO4-v, highlighting new physics in overdoped regions and challenging the assumption that superconductivity arises solely from stoichiometric CuO2 layers.

Contribution

It provides a critical review of previous studies, emphasizing the role of oxygen vacancies and proposing new directions for understanding the pairing mechanism.

Findings

Superconductivity with Tc ~ 95K observed in Sr2CuO4-v

Evidence suggests 30% oxygen vacancies in CuO2 layers

New physics appears in highly overdoped cuprate regions

Abstract

A critical review of previous investigations of the superconductivity with enhanced Tc ~ 95K found in Sr2CuO4-v shows that new physics occurs in a highly overdoped region of the cuprate phase diagram. Moreover, evidence is adduced from the literature that 30% of the oxygen sites in the CuO2 layers are vacant, a conclusion which is at odds with the universally made assumption that superconductivity originates in stoichiometric CuO2 layers. While further research is needed in order to identify the pairing mechanism(s) responsible for the enhanced Tc, we suggest possible candidates.