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We prepared a series of Mg_{1-x}(AlLi)_{x}B_2 samples with0&#8804;x&#8804;0.45 in order to compensate with Li the electron doping inducedby Al. Structural characterization by means of neutron and X-ray diffractionconfirms that Li enters the MgB2 structure even though in an amount less thannominal one. We performed susceptibility, resistivity and specific heatmeasurements. Vibrational properties were also investigated by means of Ramanspectroscopy. We compare these results with those obtained on a homologousseries of Mg_{1-x}Al_{x}B_2 samples. The systematic success of scaling therelevant properties with the Al content rather than with the electron dopingsuggests that lattice deformation plays an important role in tuning thesuperconducting properties.Comment: 15 pages, 13 figures; changes: "codoped" instead of "co-doped"; added  comments in the Fig. 11 caption Comments 31/1/2006: 16 figures ; new revised  version of the manuscrip

physical review. b, condensed matter and materials physics

Role of charge doping and lattice distortions in codoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Mg</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant="normal">Al</mml:mi><mml:mi mathvariant="normal">Li</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">B</mml:…

Role of charge doping and lattice distortions in codopedMg1−x(AlLi)xB