Superconductivity in the Silicon Clathrate Compound (Na,Ba) xSi46
Hitoshi Kawaji, Hiro-omi Horie, Shoji Yamanaka, Mitsuo Ishikawa
DOI 10.1103/PhysRevLett.74.1427 · Physical Review Letters
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Abstract
A new silicon clathrate compound containing barium, (Na,Ba) xSi46, becomes a type-II superconductor with a critical temperature (Tc) of about 4 K. In the compound, the silicon atoms are bonded tetrahedrally with about the same bond distances as in ordinary cubic diamond Si, but form 12- and 14-hedral cages which are linked by shared faces. The metal atoms are located in the center of the polyhedra. This is the first superconductor consisting of a Si sp3 covalent network.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na2.9Ba4.5Si46 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | onset |
| Na2.9Ba4.5Si46 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | zero_resistance |
| Na2.9Ba4.5Si46 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | onset |
| LaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
| CaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.37 | Pressure not reported | unknown |
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