Growth of single crystals of RuGd-1222 ((Gd,Ce)₂Sr₂RuCu₂O_10−δ) remains a major challenge, and previous studies have indicated that epitaxial thin films of these compounds exhibit deteriorated superconductivity. We have been working toward the synthesis of RuGd-1222 single crystals using the self-flux and partial melting techniques. In this paper, we report on the synthesis of RuGd-1222 single-crystal lumps by partial melting. The maximum size of a single crystal was approximately 80 μm in length, which is almost the same as that of our previous studies by self-flux method. Although these samples contained some impurity phases, the predominant phase was confirmed to be RuGd-1222. Furthermore, following optimization of the synthetic conditions, superconductivity with an onset transition temperature (T_c-onset) of 27 K was observed for a RuGd-1222 single-crystal lump prepared by partial melting. Local decomposition from RuGd-1222 plate-like crystals to RuGd-1212 single crystals was observed after prolonged sintering. The synthesis of single crystals of ruthenocuprates by partial melting is expected to contribute to an improved understanding of this class of magnetosuperconductors.

RuGd-1222（（钆，铈）的单个晶体的生长₂的Sr ₂ RuCu ₂ ö _10-δ）仍然是主要挑战，并且先前的研究表明这些化合物的外延薄膜表现出劣化的超导性。我们一直在努力利用自熔和部分熔融技术合成RuGd-1222单晶。在本文中，我们报告了通过部分熔融合成RuGd-1222单晶团块。单晶的最大尺寸大约为80μm，这与我们以前通过自熔法进行的研究几乎相同。尽管这些样品含有一些杂质相，但主要相被证实为RuGd-1222。此外，在优化合成条件之后，具有起始转变温度（T _{c-起始）的}超导_性对于通过部分熔融制备的RuGd-1222单晶块，观察到27K）。长时间烧结后，观察到从RuGd-1222板状晶体到RuGd-1212单晶的局部分解。预计通过部分熔融合成钌铜酸盐的单晶有助于改善对这类磁超导体的理解。