The recently discovered FeAs-based superconductors are a new, promising set of materials for technological and basic research. They offer transition temperatures as high as 55 K as well as essentially isotropic, and extremely large, upper, superconducting critical fields, in excess of 40 T at 20 K. In addition, they may well provide insight into exotic superconductivity that extends beyond just FeAs-based superconductivity, perhaps even shedding light on the still-perplexing CuO-based high- materials. Whereas superconductivity can be induced in the RFeAsO (R = rare earth) and AEFeAs (AE = Ba, Sr, Ca) families by several means, transition metal (TM) doping of BaFeAs [e.g., Ba(FeTM)As] offers the easiest experimental access to a wide set of materials and states. In this review, we present an overview and summary of the effect of TM-doping (TM = Co, Ni, Cu, Pd, and Rh) on BaFeAs. The resulting phase diagrams reveal the nature of the interaction between the structural, magnetic, and superconducting phase transitions in these compounds and delineate a region of phase space that allows for the stabilization of superconductivity.


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  • Article Type: Review Article
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