Growth and post-annealing studies of La-Bi2201 single crystals

Abstract

Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_{6+\delta }$ (0$\le x\le$1.00) single crystals with high-quality have been grown successfully using the travelling-solvent floating-zone technique. The patterns of X-ray diffraction suggest high crystalline quality of the samples. After post-annealing in flowing oxygen at 600 ${}^o$C, the crystals show sharp superconducting transitions revealed by AC susceptibility. The hole concentration $p$ is deduced from superconducting transition temperature ($T_c$), which exhibits a linear relation with La doping level $x$. It ranges from the heavily overdoped regime ($p\approx$ 0.2) to the extremely underdoped side ($p\approx$ 0.08) where the superconductivity is absent. Comparing with the superconducting dome in Bi${}_{2+x}$Sr${}_{2-x}$CuO${}_{6+\delta }$ system, the effects from out-of-plane disorders show up in our samples. Besides the La doping level $x$, the superconductivity is also sensitive to the content of oxygen which could be tuned by post-annealing method over the whole doping range. The post-annealing effects on $T_c$ and $p$ for each La doping level are studied, which give some insights on the different nature between overdoped and underdoped regime.

6 pages, 6 figures

References in corpus (2)

• Imaging the impact on cuprate superconductivity of varying the inter-atomic distances within individual crystal unit-cells
• Growth and Characterization of Bi${}_{2+x}$Sr${}_{2-x}$CuO${}_{6+\delta }$ Single Crystals

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• Real-space pairing through a confined local nematic state in cuprate superconductors
• Stripe Symmetry of Short-range Charge Density Waves in Cuprate Superconductors
• "Half-Bogoliubons" as the intermediate states for the phase coherence in underdoped cuprates