On heavy carbon doping of MgB2
نویسندگان
چکیده
منابع مشابه
Carbon Doping in MgB2 : Role of Boron and Carbon px(y) Bands
We have studied the changes in the electronic structure and the superconducting transition temperature Tc of Mg(B1−xCx)2 alloys as a function of x with 0 ≤ x ≤ 0.3. Our densityfunctional-based approach uses coherent-potential approximation to describe the effects of disorder, Gaspari-Gyorffy formalism to estimate the electron-phonon matrix elements and Allen-Dynes equation to calculate Tc in th...
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We argue, based on band structure calculations and the Eliashberg theory, that the observed decrease of T(c) of Al and C doped MgB2 samples can be understood mainly in terms of a band filling effect due to the electron doping by Al and C. A simple scaling of the electron-phonon coupling constant lambda by the variation of the density of states as a function of electron doping is sufficient to c...
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We have studied the evolution of superconducting and normal state properties of neutron irradiated Mg(B.962C.038)2 wire segments as a function of post exposure annealing time and temperature. The initial fluence fully suppressed superconductivity and resulted in an anisotropic expansion of the unit cell. Superconductivity was restored by post-exposure annealing. The upper critical field, Hc2(T=...
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Ti-sheathed MgB2 wires doped with different amount of nanosized rare-earth oxide (Yb2O3, Gd2O3, and Dy2O3) and/or nanosized SiC were investigated. X-ray diffraction patterns suggested the existence of Mg2Si phase due to the SiC addition, while no any phase related to rare-earth oxide could be detected. Strong enhancement of in-field current carrying capability was observed on 2.5 wt.% Yb2O3 dop...
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Due to their graphene-like properties after oxygen reduction, incorporation of graphene oxide (GO) sheets into correlated-electron materials offers a new pathway for tailoring their properties. Fabricating GO nanocomposites with polycrystalline MgB2 superconductors leads to an order of magnitude enhancement of the supercurrent at 5 K/8 T and 20 K/4 T. Herein, we introduce a novel experimental a...
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ژورنال
عنوان ژورنال: Physica C: Superconductivity and its Applications
سال: 2005
ISSN: 0921-4534
DOI: 10.1016/j.physc.2005.05.002