BaT2As2 single crystals (T=Fe, Co, Ni) and superconductivity upon Co-doping
نویسندگان
چکیده
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
متن کاملSuperconductivity upon Co-doping
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 de...
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A series of 122 phase BaFe2−xNixAs2 (x = 0, 0.055, 0.096, 0.18 and 0.23) single crystals was grown by the self-flux method and a dome-like Ni doping dependence of the superconducting transition temperature was discovered. The transition temperature T on c reaches a maximum of 20.5K at x = 0.096, and it drops to below 4K as x > 0.23. The negative thermopower in the normal state indicates that th...
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We present for the first time pseudoelasticity and shape memory results on Co–Ni–Al single crystals in tension. The experimental transformation strains approached 6% in tension in the [115] orientation. Despite the considerable volume change (0.0447), the transformation exhibits remarkable pseudoelasticity and shape memory recoverability in tension. A theoretical treatment is presented to expla...
متن کاملSuperconductivity at 22 K in Co-doped BaFe2As2 crystals.
Here we report bulk superconductivity in BaFe1.8Co0.2As2 single crystals below Tc=22 K, as demonstrated by resistivity, magnetic susceptibility, and specific heat data. Hall data indicate that the dominant carriers are electrons, as expected from simple chemical reasoning. This is the first example of superconductivity induced by electron doping in this family of materials. In contrast with cup...
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ژورنال
عنوان ژورنال: Physica C: Superconductivity
سال: 2009
ISSN: 0921-4534
DOI: 10.1016/j.physc.2009.03.025