Back to the A15 instability problems

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Abstract
Recent experimental results obtained on A15 compounds allow a better understanding of the correlation between superconductivity and lattice instability in this system. The effect of the lattice distortion is shown to reduce the superconducting transition T c. An enhancement of Tc in the case of V3Si is obtained when the temperature of the martensitic transition is lowered (by pressure or defects). Theoretically, these effects are well explained and predictable within the frame work of the band Jahn-Teller « models »; then also give more arguments in favour of these models