Superconductivity in the complex metallic alloy β−Al3Mg2
E. Bauer, H. Kaldarar, R. Lackner, H. Michor, W. Steiner, E.-W. Scheidt, A. Galatanu, F. Marabelli, T. Wazumi, K. Kumagai, M. Feuerbacher
DOI 10.1103/PhysRevB.76.014528 · Physical Review B
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Abstract
Transport and thermodynamic properties were studied for the complex metallic compound β−Al3Mg2, composed of 925 atoms per unit cell. β−Al3Mg2 exhibits bulk superconductivity below Tc=0.87K. An exponential temperature dependence of the specific heat well below Tc indicates BCS-like behavior with a nodeless gap of width ΔBCS(0)≈1.5K. The coherence length is derived as ξ0=4.85×10−8m and the Ginzburg Landau parameter κGL≈13, characterizing β−Al3Mg2 as a type II superconductor. Superconductivity in β−Al3Mg2 occurs in the absence of inversion symmetry of the crystal. Surprisingly, in spite of the rather complex crystal structure of β−Al3Mg2, physical properties turn out to be quite simple.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al3Mg2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.87 | Pressure not reported | unknown |
| Al3Mg2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.9 | Pressure not reported | midpoint |
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.14 | Pressure not reported | unknown |
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