Advances in single crystal growth and annealing treatment of electron-doped HTSC

Abstract

High quality electron-doped HTSC single crystals of $\mathrm{P}{\mathrm{r}}_{2-\mathrm{x}}\mathrm{C}{\mathrm{e}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_{4+\delta }$ and $\mathrm{N}{\mathrm{d}}_{2-\mathrm{x}}\mathrm{C}{\mathrm{e}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_{4+\delta }$ have been successfully grown by the container-free traveling solvent floating zone technique. The optimally doped $\mathrm{P}{\mathrm{r}}_{2-\mathrm{x}}\mathrm{C}{\mathrm{e}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_{4+\delta }$ and $\mathrm{N}{\mathrm{d}}_{2-\mathrm{x}}\mathrm{C}{\mathrm{e}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_{4+\delta }$ crystals have transition temperatures $T_{\mathrm{c}}$ of $25$\,K and $23.5$\,K, respectively, with a transition width of less than $1$\,K. We found a strong dependence of the optimal growth parameters on the Ce content $x$. We discuss the optimization of the post-growth annealing treatment of the samples, the doping extension of the superconducting dome for both compounds as well as the role of excess oxygen. The absolute oxygen content of the as-grown crystals is determined from thermogravimetric experiments and is found to be $\ge 4.0$. This oxygen surplus is nearly completely removed by a post-growth annealing treatment. The reduction process is reversible as demonstrated by magnetization measurements. In as-grown samples the excess oxygen resides on the apical site O(3). This apical oxygen has nearly no doping effect, but rather influences the evolution of superconductivity by inducing additional disorder in the CuO${}_2$ layers. The very high crystal quality of $\mathrm{N}{\mathrm{d}}_{2-\mathrm{x}}\mathrm{C}{\mathrm{e}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_{4+\delta }$ is particularly manifest in magnetic quantum oscillations observed on several samples at different doping levels. They provide a unique opportunity of studying the Fermi surface and its dependence on the carrier concentration in the bulk of the crystals.

arXiv comment19 pages, 7 figures, submitted to Eur. Phys. J. B

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Cited by in corpus (14)

• The Strange Metal State of the Electron-Doped Cuprates
• Magnetic Breakdown in the electron-doped cuprate superconductor Nd${}_{2-x}$Ce${}_x$CuO${}_4$: the reconstructed Fermi surface survives in the strongly overdoped regime
• Correlation between Fermi surface transformations and superconductivity in the electron-doped high-$T_c$ superconductor Nd${}_{2-x}$Ce${}_x$CuO${}_4$
• Distribution of electrons and holes in cuprate superconductors as determined from ${}^{17}$O and ${}^{63}$Cu nuclear magnetic resonance
• Impact of the interface quality of Pt/YIG(111) hybrids on their spin Hall magnetoresistance
• Electron interactions and charge ordering in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Fermi Surface of the Electron-doped Cuprate Superconductor Nd_{2-x}Ce_xCuO_{4} Probed by High-Field Magnetotransport
• Emergence of pseudogap from short-range spin-correlations in electron doped cuprates
• An Investigation of Particle-Hole Asymmetry in the Cuprates via Electronic Raman Scattering
• Vortex Dynamics and Phase Diagram in the Electron Doped Cuprate Superconductor Pr${}_{0.87}$LaCe${}_{0.13}$CuO${}_4$
• ${}^{139}$La NMR investigation in underdoped La${}_{1.93}$Sr${}_{0.07}$CuO${}_4$
• Muon spin relaxation study of the spin correlation in the overdoped regime of electron-doped high-Tc cuprate superconductors
• Magnetotransport evidence of irreversible spin reorientation in the collinear antiferromagnetic state of underdoped ${\mathrm{Nd}}_{2-x}{\mathrm{Ce}}_x{\mathrm{CuO}}_4$
• Unravelling the glue and the competing order in superconducting cuprates