Electron-beam floating-zone refined UCoGe

The interplay between unconventional superconductivity and quantum critical ferromagnetism in the U-Ge compounds represents an open problem in strongly correlated electron systems. Sample quality can have a strong influence on both of these ordered states in the compound UCoGe, as is true for most unconventional superconductors. We report results of a different approach at UCoGe crystal growth using a floating-zone method with potential for improvements of sample quality and size as compared with traditional means such as Czochralski growth. Single crystals of the ferromagnetic superconductor UCoGe were produced using an ultra-high vacuum electron-beam floating-zone refining technique. Annealed single crystals show well-defined signatures of bulk ferromagnetism and superconductivity at T-c similar to 2.6 K and T-s similar to 0.61 K, respectively, in the resistivity and heat capacity. Scanning electron microscopy of samples with different surface treatments shows evidence of an off-stoichiometric uranium-rich phase of UCoGe collected in cracks and voids that might be limiting sample quality.

Automated summary

The interplay between unconventional superconductivity and quantum critical ferromagnetism in the U-Ge compounds is a complex issue in strongly correlated electron systems. Sample quality plays a significant role in influencing the ordered states in compounds like UCoGe. A new approach using a floating-zone method for UCoGe crystal growth shows potential for improving sample quality and size, with single crystals demonstrating bulk ferromagnetism and superconductivity characteristics.