Anomalies in the superconducting dome of the Bi-cuprates

TL;DR

This study investigates anomalies in the superconducting transition temperature of Bi-cuprate single crystals at specific hole doping levels, revealing their potential universality in hole-doped high-temperature superconductors.

Contribution

It provides new experimental evidence of doping-related anomalies in Bi-cuprates, linking them to known phenomena in other high-Tc superconductors.

Findings

Anomalies at 1/8 hole doping in Bi-cuprates.

Doping anomalies align with 'magic doping fractions' in LSCO.

Findings suggest these anomalies are universal in hole-doped high-Tc superconductors.

Abstract

We report characterization results by energy dispersive x-ray analysis and AC-susceptibility for a statistically relevant number of single layer Bi-cuprate single crystals. We show that the two structurally quite different modifications of the single-layered Bi-cuprate, namely (La,Pb=0.4)-Bi2201 and La-Bi2201, exhibit anomalies in the superconducting transition temperature at certain hole doping, e.g. at 1/8 holes per Cu. These doping values agree well with the 'magic doping fractions' found in the temperature dependent resistance of LSCO by Komiya et al. This new set of findings suggests that all these anomalies are generic for the hole-doped high-temperature superconductors.