Stress-Induced Electronic Transition (2.5 Order) in Al

The effect of uniaxial stress (σ) on the superconducting transition temperature (Tc), resistivity (ρ), and magnetothermopower of Al has been measured. It has been found that [∂Tc∂σ]_σ=0=(9.6±0.5)×10^-11 K/Pa. Further, it is found that an anomaly exists in ∂Tc∂σ and ∂ρ∂σ near σ=0.5 GPa, and that the magnetothermopower oscillations associated with the α orbit in the third-zone electron surface disappear at σ=0.54 GPa.