Abstract
AbstractWe present properties of single crystals of the iron pnictide superconductor RbFe2As2 grown using a self‐flux method. A bulk superconducting transition at 2.6 K was consistently observed in resistivity, magnetic susceptibility, and specific heat measurements. While the resistivity behaves like a conventional metal at low T, the magnetic susceptibility shows an unusual broad maximum around 80 K in the normal state. A large Sommerfeld coefficient, , was observed seemingly a common feature of heavily hole‐doped “122” compounds. In the superconducting state, we analyzed our specific heat data based on the s‐ and d‐wave two‐gap models. The presence of the small gap with 2/ was discussed to account for the large specific heat contribution remaining to low T far below . The large anisotropy ratio, = / 7 near indicates that the large gap would occupy a highly two‐dimensional Fermi surface.
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