Abstract
A microscopic theoretical model is developed to examine how the superconducting transition (ST) and the “martensitic” transition (MT) influence each other in the A15 compounds. The ST is modelled via the BCS interaction while the MT is believed to be driven by the band Jahn-Teller effect. It is assumed that both these transitions involve electrons belonging to the band that evolves from the doubly degenerate Γ 12 state near the Fermi energy. Effect of disorder on the MT temperature T m and the ST temperature T c is also studied using this model. The results are in agreement with the experiments. The model also predicts that when T m ≳ T C, the tetragonal phase can revert back to the cubic phase below T C. X-ray measurement on V 3Si under ≈20 kbar pressure is suggested to verify this prediction.
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