Iron Pnictide Super Conductors

The discovery of new superconductor LaFeAsOiÀ€€xFx with a superconducting criticalrntemprature, Tc of 26K in 2008 has quickly renewed interest in the exploration of iron-rnbased superconductors. More new superconductors have been discovered with the highestrnTc of up to 55K being observed in the SmFeAsO1ð€€€xFx compound. High Tc have previoslyrnonly been observed in cuprates, these new iron based superconductors have been addedrnas second member of high Tc family. The crystal structur of these compound contains anrnalmoost 2D Fe-As layer formed by FeAS4 tetrahedrons,which can be separeted an ionicrnlayer that provides an extra electron to Fe-As layer superconductivity can be induced byrncarrier doping,which destroy the antifrromagnetic ground state. The pairing mechanisimrnhas been clari ed as unconventional and antiferromagnetic(AF) spin rnuctuations (SFs)rnseem to play an important role in making these pairs. In this paper superconductingrncrystal structur, physical properties of parent compounds, pressure e ects, the electronicrnstate of the compounds will be presented

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