Compound formation and superconductivity in Au-Si: X-ray absorption measurements on ion-beam-mixed Au-Si films
Y. Jeon, N. Jisrawi, G. Liang, F. Lu, M. Croft, W. L. McLean, D. L. Hart, N. G. Stoffel, J. Z. Sun, T. H. Geballe
DOI 10.1103/PhysRevB.39.5748 · Physical Review B
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Abstract
Multilayered Au-Si thin films have been deposited with the net compositions ‘‘Au1−xSix,’’ x=0.29, 0.5, and 0.8. After ion-beam mixing these films exhibited superconductivity in the 0.3–1.2 K range despite the nonsuperconducting character of both Au and Si. Near-edge x-ray absorption spectroscopy (XAS) measurements on the Au L3 edge in these films indicate that metastable Au-Si compound formation occurs in these ion-mixed materials. Specifically, the XAS measurements indicate changes in Au 5d-orbital occupancy and changes in the local Au structural environment which are both consistent with local compound formation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Au0.71Si0.29 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure unresolved | onset |
| Au0.5Si0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure unresolved | onset |
| Au0.2Si0.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure unresolved | onset |
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