Superconducting state of Ca-VII below a critical temperature of 29 K at a pressure of 216 GPa
Masafumi Sakata, Yuki Nakamoto, Katsuya Shimizu, Takahiro Matsuoka, Yasuo Ohishi
DOI 10.1103/PhysRevB.83.220512 · Physical Review B
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Abstract
Pressure-induced superconductivity and structural phase transitions in calcium (Ca) were studied by electrical resistance measurements and angular dispersive x-ray diffraction measurements under pressures above 200 GPa. Other alkaline-earth metals, Sr and Ba, have a high-pressure phase with a “host-guest” structure, and the maximum superconducting transition temperature Tc is observed in this phase. However, the high-pressure phase with the host-guest structure has not yet been observed in Ca. In this work, we found a high-pressure phase (Ca-VII) around 210 GPa with a host-guest structure. Furthermore, the Tc onset at Ca-VII increased continuously, reaching 29 K at 216 GPa.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | 216 GPa | onset |
| Ca Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | 161 GPa | onset |
| Ca Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | 85 GPa | onset |
| Ca Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | 44 GPa | onset |
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