The Tc amplification by quantum interference effects in diborides

Abstract

The model of two (s and p) channel superconductivity known to be necessary to explain the superconductivity in MgB2 has been applied to the Al1-xMgxB2 diborides by tuning x from MgB2 to AlMgB4. The evolution of the interband coupling parameter (probing the strength of the interchannel pairing due to quantum interference effects) and the two gaps in the s and p channel as a function of x have been calculated. While in MgB2 the quantum interference effects give an amplification of Tc by a factor of 1.5 in comparison with the dominant intra s band single channel pairing, in AlMgB4 the amplification is about 100, in comparison with the dominant intra p band single channel pairing.

7 pages, 6 figures

References in corpus (12)

• Specific Heat of Mg ^{11}B_2
• Giant anharmonicity and non-linear electron-phonon coupling in MgB${}_2$; A combined first-principles calculations and neutron scattering study
• Two Gap State Density in MgB${}_2$: A True Bulk Property or A Proximity Effect?
• Two-gap superconductivity in MgB${}_2$: clean or dirty?
• Two-Band Superconductivity in MgB2
• The gap amplification at a "shape resonance" in a superlattice of quantum stripes: a mechanism for high Tc
• Effects of Al doping on the structural and electronic properties of Mg(1-x)Al(x)B2
• de Haas-van Alphen effect in single crystal MgB_2
• On the Possibility of New High Tc Superconductors by Producing metal Heterostructures as in the Cuprate Perovskites
• Effect of Al doping on the optical phonon spectrum in Mg(1-x)Al(x)B(2)
• Interpretation of the de Haas - van Alphen experiments in MgB2
• Manifestation of multiband optical properties of MgB${}_2$

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