【摘 要】
：
The parent compound of the AFe2As2 (A=Ca,Sr,Ba) family of Fe-based superconductors is an antiferromagnetic (AFM) bad metal characterized by a Dirac cone electro
【机 构】
：
Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy
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The parent compound of the AFe2As2 (A=Ca,Sr,Ba) family of Fe-based superconductors is an antiferromagnetic (AFM) bad metal characterized by a Dirac cone electronic dispersion.[1] Superconductivity occurs in this material after suppression of long-range AFM order following the application of pressure[2,3]or the injection of electronic carriers into the Fe-As layers.[4,5] Recently,a few groups reported the synthesis of rare-earth-doped CaFe2As2 samples exhibiting superconductivity[6-8] at temperatures as high as 49 K,raising enthusiasm in the community as well as fundamental questions.In addition to carrier doping,various sizes of the substituted rare-earth can act as chemical pressure,thus allowing a high flexibility in shaping the electronic structure of these materials.
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