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Effect of low-temperature compression on superconductivity and crystal structure in strontium metal
Document Type
Article
Publication Date
11-25-2024
Academic Department
Physics
Abstract or Description
The superconducting and structural properties of elemental strontium metal were investigated under pressures up to 60 GPa while maintaining cryogenic conditions during pressure application. Applying pressure at low temperatures reveals differences in superconducting and structural phases compared to previous reports obtained at room temperatures. Notably, the superconducting critical temperature exhibits a twofold increase under compression after cryogenic cooling within the pressure range of 35–42 GPa, compared to cryogenic cooling after room-temperature compression. Subsequently, the transition width becomes significantly sharper above 42 GPa. Low-temperature x-ray diffraction measurements under pressure reveal that this change corresponds to the Sr-III to Sr-IV transition, with no evidence of any metastable structure. Furthermore, the monoclinic Sr-IV structure was observed to remain stable to much higher pressures—at least up to 60 GPa, without the appearance of the incommensurate Sr-V phase present at room temperature. This implies that thermal activation energy plays an important role in overcoming the presence of a kinetic barrier to the Sr-V phase at room temperature.
Recommended Citation
Lim, Isaiah Jinhyuk; Sinha, S.; Jackson, D. E.; Kumar, R. S.; Park, C.; Hemley, R. J.; VanGennep, D.; Vohra, Y. K.; and Hennig, R. G., "Effect of low-temperature compression on superconductivity and crystal structure in strontium metal" (2024). All Faculty Scholarship. 34.
https://thekeep.eiu.edu/all_faculty_pubs/34
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