Superconductivity, superstructure, and structure anomalies in Mg1−xAlxB2
J. Q. Li, L. Li, F. M. Liu, C. Dong, J. Y. Xiang, Z. X. Zhao
DOI 10.1103/PhysRevB.65.132505 · Physical Review B
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Abstract
The presence of a superstructure is identified to play a key role for the modifications in both superconductivity and structure transitions in the Mg1−xAlxB2 system. This superstructure occurs along the c-axis direction, and can be well interpreted by Al-layer ordering. The optimal composition of the superstructure phase is MgAlB4, a superconductor with Tc∼12K. Raman spectrum of MgAlB4 gives rise to a sharp peak at around 941 cm−1. Brief diagrams illustrating the superconductivity and structural features of Mg1−xAlxB2 (0<~x<~1) materials are presented.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgAlB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| MgAlB4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| Mg0.5Al0.5B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| Mg0.5Al0.5B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | 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 |
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