The Tc amplification by quantum interference effects in diborides

Details The Tc amplification by quantum interference effects in diborides The Tc amplification by quantum interference effects in diborides

2002-11-18

arxiv.org/abs/cond-mat/0211389v1

Bussmann-Holder, A. & Bianconi, A. Raising the diboride superconductor transition temperature using quantum interference effec

Physics

Condensed Matter

Superconductivity

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.67.132509

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.

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