电子束浮区精炼UCoGe
Electron-beam Floating-zone Refined UCoGe
摘要：
在强关联电子系统中，U-Ge化合物的非常规超导电性和量子临界铁磁性之间的相互作用是一个悬而未决的问题。样品质量对UCoGe化合物中的这两种有序态都有很大的影响，这对大多数非常规超导体来说都是如此。我们报告的结果，在UCoGe晶体生长的一种新的方法，使用浮区法与传统的手段，如直拉法生长相比，样品的质量和尺寸的改善潜力。采用超高真空电子束浮区精炼技术制备了铁磁超导体UCoGe单晶。退火单晶显示出良好定义的签名体铁磁性和超导性在$T_c \sim$ 2.6 K和$T_s \sim$ 0.55 K，分别在电阻率和热容。不同表面处理的样品的扫描电子显微镜显示在裂纹和空隙中收集的UCoGe的非化学计量的富铀相的证据，这可能限制样品质量。
英文摘要：
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 new 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 \sim$2.6 K and $T_s \sim$0.55 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.
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