Crystal structure of the superconducting phases of S and Se
Olga Degtyareva, Eugene Gregoryanz, Maddury Somayazulu, Ho-kwang Mao, Russell J. Hemley
DOI 10.1103/PhysRevB.71.214104 · Physical Review B
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Abstract
Compressed S and Se are studied by x-ray diffraction with synchrotron radiation up to 160 GPa. Phase IV of S is shown to have a body-centered monoclinic structure and is stable between 83 and 153 GPa, where it transforms to S-V with a primitive rhombohedral β-Po structure. Observation of the modulation reflections in S-IV up to 135 GPa shows that its crystal structure is incommensurately modulated, the same as known for Se and Te. Our study on the stability range of the modulated phase of Se (Se-IV) shows that Se-IV transforms to the β-Po phase Se-V at around 80 GPa. Pressure dependence of the structural parameters of these high-pressure phases in S and Se are discussed in relation to their superconducting behavior.
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. | — | Pressure not reported | unknown |
| Te Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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