The recently discovered 12442-type ACa 2 Fe 4 As 4 F 2 (A = K, Rb, Cs) compounds are the only iron-based superconductors (IBSs) with double FeAs layers between neighboring insulating layers, analogous to the double CuO 2 layers in some high- T c cuprates. Here, we report the study of vortex phase diagram of RbCa 2 Fe 4 As 4 F 2 single crystal via magneto-transport and magnetization measurements. The resistive transition under magnetic fields shows a foot-like kink at a characteristic temperature, T s , followed by a resistive tail in nearly zero resistivity region. Such behavior is ascribed to a vortex slush transition at T s , below which the vortex state has short-range vortex lattice correlation, and then a second-order transition into the vortex glass phase occurs with further decreasing temperature. Above T s , the Arrhenius...

中文翻译：

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磁输运和磁化强度测量显示12442型RbCa 2 Fe 4 As 4 F 2单晶的涡旋相图

最近发现的12442型ACa 2 Fe 4 As 4 F 2（A = K，Rb，Cs）化合物是唯一的铁基超导体（IBSs），在相邻绝缘层之间具有双重FeAs层，类似于双重CuO 2层在一些高T c的铜酸盐中。在这里，我们通过磁传输和磁化测量报告了RbCa 2 Fe 4 As 4 F 2单晶的旋涡相图的研究。磁场下的电阻跃变在特征温度T s处显示出类似脚的扭结，随后在接近零的电阻率区域出现电阻尾。这种行为归因于在T s的涡旋过渡转变，在该温度以下，涡旋状态具有短程涡旋晶格相关性，然后随着温度的进一步降低，发生了向涡旋玻璃相的二阶转变。在T s以上，阿累尼乌斯...