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.
@article{arxiv.1505.06014,
title = {Growth and Characterization of Millimeter-sized Single Crystals of CaFeAsF},
author = {Yonghui Ma and Hui Zhang and Bo Gao and Kangkang Hu and Qiucheng Ji and Gang Mu and Fuqiang Huang and Xiaoming Xie},
journal= {arXiv preprint arXiv:1505.06014},
year = {2015}
}
Comments
4 pages, 3 figures, accepted by Superconductor Science and Technology