Pressure-induced superconductivity in strontium and barium

Abstract
The electrical-resistance behavior of strontium is studied for various pressures from 250 up to 500 kbar and for temperatures from 2 to 300 K. Superconductivity has been observed in strontium for pressures higher than 350 kbar. The superconducting transition temperature varies from 3 to 4 K with dTcdP being positive in the pressure range investigated. Superconductivity in Ba is also investigated for pressures from 200 to 400 kbar. dTcdP for Ba becomes negative in this pressure range.