毫米级CaFeAsF单晶的生长与表征
Growth and Characterization of Millimeter-sized Single Crystals of CaFeAsF
摘要：
高质量和大尺寸的单晶对于研究非常规超导体的本征性质至关重要，这是铁基超导体的1111相所缺乏的。本文报道了用自熔法成功地生长出1-2 mm的CaFeAsF单晶。由于获得了高质量的单晶体，研究了其结构和输运性质，具有较高的可靠性。通过使用单晶X-射线衍射数据来细化结构，这证实了先前基于粉末数据的报道。在121 K时，从电阻率、磁阻和磁化率测量中观察到与结构转变相关的明显异常。另一个扭结功能在110 K，最有可能的反铁磁过渡的指示，也检测到的电阻率数据。我们的结果为进一步研究铁基超导体1111相的物理性质提供了依据。
英文摘要：
High-quality and sizable single crystals are crucial for studying the intrinsic properties of unconventional superconductors, which are lacking in the 1111 phase of the Fe-based superconductors. Here we report the successful growth of CaFeAsF single crystals with the sizes of 1-2 mm using the self-flux method. Owning to the availability of the high-quality single crystals, the structure and transport properties were investigated with a high reliability. The structure was refined by using the single-crystal x-ray diffraction data, which confirms the reports earlier on the basis of powder data. A clear anomaly associated with the structural transition was observed at 121 K from the resistivity, magnetoresistance, and magnetic susceptibility measurements. Another kink-feature at 110 K, most likely an indication of the antiferromagnetic transition, was also detected in the resistivity data. Our results supply a basis to propel the physical investigations on the 1111 phase of the Fe-based superconductors.
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