Growth, characterization and physical properties of high-quality large single crystals of Bi$_2$Sr$_{2-x}$La$_{x}$CuO$_6$ high-temperature superconductors

TL;DR

This study reports the successful growth and detailed characterization of high-quality large single crystals of La-doped Bi2201 high-temperature superconductors, covering a wide doping range and providing valuable samples for further research.

Contribution

It introduces a reliable method to produce large, high-quality La-Bi2201 single crystals across various doping levels, enabling advanced studies of their superconducting properties.

Findings

Superconducting crystals obtained across a wide doping range.

Crystals up to approximately 40 mm in size.

Sharp superconducting transitions with narrow widths.

Abstract

High quality large Bi$_2$Sr$_{2-x}$La$_{x}$CuO$_6$(La-Bi2201) single crystals have been successfully grown by the traveling solvent floating zone technique. The samples are characterized by compositional and structural analyzes and their physical properties are investigated by magnetic susceptibility and resistivity measurements. Superconducting samples with sharp superconducting transitions are obtained covering a wide range of doping from overdoped (x<0.40), optimally-doped (x~0.40), underdoped (0.40<x<0.84) to heavily underdoped without superconducting transition (x>0.84). Crystals as large as ~40 * 2.0 * 1 mm3 are obtained for x=0.73. Sharp superconducting transition with a width less than 2 K and nearly perfect Meissner signal of superconductivity are achieved for x=0.40. The availability of the La-Bi2201 single crystals will provide an ideal system to study the physical properties, electronic structure and mechanism of high temperature superconductivity