Abstract
The effect of non-hydrostatic stress on the cubic-to-tetragonal (C-T) transition and the superconductivity (SC) in the A15 compounds has been studied theoretically. The author has assumed that the C-T transition is driven by the band Jahn-Teller effect involving the electronic band which evolves from the doubly degenerate Gamma 12 state at the centre of the cubic Brillouin zone. The SC is also assumed to pertain to this band. He has shown that both the C-T transition and the SC should be affected by the Gamma 12 symmetry-adapted stress ( sigma 12+ sigma 22)1/2, where sigma 1=(s1-s2)/21/2, sigma 2=(2s3-s1-s2)/61/2 and si are the stress components in the Voigt notation. Apart from explaining several experimental results, he has pointed out that the origin of some seemingly different anomalies in the A15 compounds is due to the presence of stress in the samples.
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