Growth and hole density control through equilibrium oxygen annealing of optimally doped Y1-xCaxBa2Cu3O7-{\delta} single crystals

TL;DR

This study demonstrates precise control of growth and hole density in Y1-xCaxBa2Cu3O7-{ extdelta} single crystals via equilibrium oxygen annealing, enabling high-quality superconducting crystals with sharp transitions.

Contribution

It introduces a novel in situ conductivity monitoring method for fine-tuning oxygen content during crystal growth.

Findings

Achieved high-quality equilibrium crystals with sharp 0.2K superconducting transition

Established a method for in situ oxygen content control during crystal growth

Produced crystals with controlled hole density and optimized doping levels

Abstract

We have grown calcium and oxygen co-doped Y1-xCaxBa2Cu3O7-{\delta} single crystals using self-flux method. A method of fine tuning oxygen content to reach the equilibrium state through in situ monitoring of the conductivity change is established. Structural, compositional and electronic property characterizations of optimally co-doped Y1-xCaxBa2Cu3O7-{\delta} crystals indicate that they are high quality equilibrium crystals with a sharp superconducting transition width of 0.2K.