Anisotropy of iron-platinum-arsenide Ca-10(PtnAs8)(Fe2-xPtxAs2)(5) single crystals

作者：Yuan F F; Sun Y^*; Zhou W; Zhou X; Ding Q P; Iida K; Huehne R; Schultz L; Tamegai T; Shi Z X

来源：Applied Physics Letters, 2015, 107(1): 012602.

DOI：10.1063/1.4926486

• Anisotropy parameters
• Ginzburg-Landau
• Interlayer distance
• Iron-based superconductors
• Resistivity measurement
• Scaling parameter
• Two dimensionality
• Upper critical fields

The upper critical field H-c2 anisotropy of Ca-10(PtnAs8)(Fe2-xPtxAs2)(5) (n=3, 4) single crystals with long FeAs interlayer distance (d) was studied by angular dependent resistivity measurements. A scaling of the angular dependent resistivity was realized for both single crystals using the anisotropic Ginzburg-Landau (AGL) approach with an appropriate anisotropy parameter gamma. The AGL scaling parameter gamma increases with decreasing temperature and reaches a value of about 10 at 0.8T(c) for both single crystals. These values are much larger than those of other iron-based superconductors (FeSCs). Remarkably, the values of gamma(2) show an almost linear increase with the FeAs/FeSe interlayer distance d for FeSCs. Compared to cuprates, FeSCs are less anisotropic, indicating that two dimensionality of the superconductivity is intrinsically weak.

• 出版日期2015-7-6
• 单位东南大学