Superconducting high pressure CaSi2 phase with Tc up to 14 K
S. Sanfilippo, H. Elsinger, M. Núñez-Regueiro, O. Laborde, S. LeFloch, M. Affronte, G. L. Olcese, A. Palenzona
DOI 10.1103/PhysRevB.61.R3800 · Physical Review B
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Abstract
We have studied the occurrence of superconductivity under pressure in the CaSi2 family of compounds, namely the semimetallic trigonal phase and the α−ThSi2-type tetragonal one. Although only the latter is superconducting (Tc=1.56K) at ambient pressure, starting from the trigonal phase and applying high pressure (>12 GPa) we have found a new superconducting phase with Tconset∼14K, among the highest ever found in silicon based materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.56 | Pressure unresolved | unknown |
| CaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | 15 GPa | onset |
| CaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.51 | Pressure unresolved | unknown |
| CaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | 9 GPa | onset |
| Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.2 | 15 GPa | unknown |
| BaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | onset |
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