Physics – Condensed Matter – Superconductivity
Scientific paper
2008-08-18
Phys. Rev. B 78, 140501(R) (2008)
Physics
Condensed Matter
Superconductivity
5 pages, 5 figures
Scientific paper
10.1103/PhysRevB.78.140501
The temperature dependent resistivity of Ba$_{1-x}$K$_x$Fe$_2$As$_2$ (x = 0.23, 0.25, 0.28 and 0.4) single crystals and the angle dependent resistivity of superconducting Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ single crystals were measured in magnetic fields up to 9 T. The measurements of temperature dependent resistivity for samples with different doping levels revealed very high upper critical fields which increase with the transition temperature monotonously, and a very low superconducting anisotropy ratio $\Gamma=H_{c2}^{ab}/H_{c2}^c \approx$ 2. By scaling the resistivity in the frame of the anisotropic Ginzburg-Landau theory, the angle dependent resistivity of the Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ single crystal measured with different magnetic fields at a certain temperature collapsed onto one curve. As the only scaling parameter, the anisotropy $\Gamma$ was determined alternatively for each temperature and was found to be between two and three.
Luo Hui-qian
Ren Cong
Wang Zhao-Sheng
Wen Hai-hu
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