Superconductivity upon Co-doping
نویسندگان
چکیده
The crystal structure and physical properties of BaFe2As2, BaCo2As2, and BaNi2As2 single crystals are surveyed. BaFe2As2 gives a magnetic and structural transition at TN = 132(1) K, BaCo2As2 is a paramagnetic metal, while BaNi2As2 has a structural phase transition at T0 = 131 K, followed by superconductivity below Tc = 0.69 K. The bulk superconductivity in Codoped BaFe2As2 below Tc = 22 K is demonstrated by resistivity, magnetic susceptibility, and specific heat data. In contrast to the cuprates, the Fe-based system appears to tolerate considerable disorder in the transition metal layers. First principles calculations for BaFe1.84Co0.16As2 indicate the inter-band scattering due to Co is weak. PAC: 74.70.-b, 81.10.-h, 74.25.-q, 74.25.Ha, 74.25.Jb
منابع مشابه
BaT 2 As 2 single crystals ( T = Fe , Co , Ni ) and superconductivity upon Co - doping
Article history: Available online 19 March 2009 PACS: 74.70. b 81.10. h 74.25. q 74.25.Ha 74.25.Jb
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