Structure and superconductivity of double-doped Mg1-x(Al0.5Li0.5)xB2

G.J. Xu, Jean-Claude Grivel, A.B. Abrahamsen, X.P. Chen, N.H. Andersen

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    A series of polycrystalline samples of Mg1-x(Al0.5Li0.5)(x)B-2 (0less than or equal toxless than or equal to0.6) were prepared by a solid state reaction method and their structure, superconducting transition temperature and magneto-transport properties were investigated by means of X-ray diffraction (XRD), ac-susceptibility and resistance in varied magnetic fields. The double doping leads to decreases in both the lattice parameters a and c. The superconducting transition temperature (T-c) decreases with double doping, but the T-c is systematically higher than that of the single Al-doped samples. It is suggested that the hole band filling has little effect on T-c at high doping level, while the disorder induced by doping plays an important role in suppressing T-c. A systematic comparison with Al-doped MgB2 of the structure, superconducting transition and irreversibility field is made. (C) 2003 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalPhysica C: Superconductivity and its Applications
    Issue number1-2
    Pages (from-to)8-14
    Publication statusPublished - 2003


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