Superconductivity of Ternary Silicide with the AlB2-Type Structure Sr(Ga0.37,Si0.63)2
Motoharu Imai, Eiji Abe, Jinhua Ye, Kenji Nishida, Takashi Kimura, Kazuhiro Honma, Hideki Abe, Hideaki Kitazawa
DOI 10.1103/PhysRevLett.87.077003 · Physical Review Letters
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Abstract
A ternary silicide Sr(Ga0.37,Si0.63)2 was synthesized by a floating zone method. Electron diffraction and powder x-ray diffraction measurements indicate that the silicide has the AlB2-type structure with the lattice constants of a=4.1427(6)Å and c=4.7998(9)Å, where Si and Ga atoms are arranged in a chemically disordered honeycomb lattice and Sr atoms are inercalated between them. The silicide is isostructural with the high-temperature superconductor MgB2 reported recently. Electrical resistivity and dc magnetization measurements revealed that it is a type-II superconductor with onset temperature of 3.5 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr(Ga0.37Si0.63)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure not reported | onset |
| Sr(Ga0.37Si0.63)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.4 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| ThSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.41 | Pressure not reported | unknown |
| CaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | 16 GPa | unknown |
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