Journal
PHYSICAL REVIEW B
Volume 78, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.140501
Keywords
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Funding
- Natural Science Foundation of China [2006CB60100]
- Ministry of Science and Technology of China [2006CB921107]
- Chinese Academy of Sciences
- [2006CB921802]
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The temperature-dependent resistivity of Ba1-xKxFe2As2 (x=0.23, 0.25, 0.28, and 0.4) single crystals and the angle-dependent resistivity of superconducting Ba0.6K0.4Fe2As2 single crystals were measured in magnetic fields up to 9 T. The data measured on samples with different doping levels revealed very high upper critical fields, which increase with the transition temperature, and a very low superconducting anisotropy ratio Gamma=H-c2(ab)/H-c2(c)approximate to 2. By scaling the resistivity within the framework of the anisotropic Ginzburg-Landau theory, the angle-dependent resistivity of the Ba0.6K0.4Fe2As2 single crystal measured with different magnetic fields at a certain temperature collapsed onto one curve. As the only scaling parameter, the anisotropy Gamma was alternatively determined for each temperature and was found to be between two and three.
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