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

doi:10.1016/j.physc.2003.09.076

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

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

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 language	English
Journal	Physica C: Superconductivity and its Applications
Volume	399
Issue number	1-2
Pages (from-to)	8-14
ISSN	0921-4534
DOIs	https://doi.org/10.1016/j.physc.2003.09.076
Publication status	Published - 2003

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

abstract = "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. ",

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AU - Xu, G.J.

AU - Grivel, Jean-Claude

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AU - Chen, X.P.

AU - Andersen, N.H.

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AB - 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.

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