Abstract
Highly sensitive magnetic-susceptibility techniques were used to measure the superconducting transition temperatures in S up to 231(±5) GPa. S transforms to a superconductor with of 10 K and has a discontinuity in dependence at 160 GPa corresponding to the bco to β-Po phase transition. Above this pressure, in S has a maximum reaching about 17.3(±0.5) K at 200 GPa and then slowly decreases with pressure to 15 K at the highest pressures measured. This trend in the pressure dependence parallels the behavior of the heavier chalcogens Se and Te. Superconductivity in Se was observed from 15 to 25 GPa with changing from 4 to 6 K and above 150 GPa with of 8 K. Similarities in the dependences for S, Se, and Te, and implications for oxygen are discussed.
- Received 16 August 2001
DOI:https://doi.org/10.1103/PhysRevB.65.064504
©2002 American Physical Society