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Single crystals of Rb{0.8}Fe2Se2 are successfully synthesized with thesuperconducting transition temperatures T_c{onset}= 31 K and T_c{zero}= 28 K. Aclear anomaly of resistivity was observed in the normal state at about 150 K,as found in a similar system KxFe2Se2. The upper critical field has beendetermined with the magnetic field along ab-plane and c-axis, yielding ananisotropy of about 3.5. The angle dependent resistivity measured below T_callow a perfect scaling feature based on the anisotropic Ginzburg-Landautheory, leading to a consistent value of the anisotropy which decreases fromabout 3.6 at around T_c to 2.9 at 27 K. Comparing to the anisotropy determinedfor Ba0.6K0.4Fe2As2 and Ba(Fe0.92Co0.08)2As2 using the same method, we findthat the present sample is more anisotropic and the Fermi surfaces withstronger two dimensional characters are expected.

Transport properties and anisotropy of Rb0.8Fe2Se2 single crystals