Abstract:

We will talk about the discovery of superconductivity with Tc higher than 40 K in Fe-based superconductors. In this talk, we show you the transport properties (resistivity, Hall coefficient, TEP ) in normal state. These results suggest a quantum phase transition around x=0.14 in SmFeAsO1-xFx system. A electronic phase diagram is proposed. Anisotropy in resistivity and susceptibility is also discussed in single crystals BaFe2As2 and CaFe2As2. The phase diagrams of Ba1-xKxFe2As2 and BaFe2-xCoxAs2 system and isotope effect are also discussed.
 
 
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