Superconductivity in the chalcogens up to multimegabar pressures
Eugene Gregoryanz, Viktor V. Struzhkin, Russell J. Hemley, Mikhail I. Eremets, Ho-kwang Mao, Yuri A. Timofeev
DOI 10.1103/PhysRevB.65.064504 · Physical Review B
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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 Tc of 10 K and has a discontinuity in Tc dependence at 160 GPa corresponding to the bco to β-Po phase transition. Above this pressure, Tc 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 Tc changing from 4 to 6 K and above 150 GPa with Tc of 8 K. Similarities in the Tc dependences for S, Se, and Te, and implications for oxygen are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Se Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.8 | 25 GPa | onset |
| Se Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.2 | 17 GPa | unknown |
| O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 95 GPa | unknown |
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