Phys. Rev. Lett. 61, 1505–1508 (1988)Thermodynamic Stability of (AlAs)n(GaAs)n Superlattices and the Random Al0.5Ga0.5As AlloyReceived 23 June 1988; published in the issue dated 26 September 1988 We calculate the total energy of random Al0.5Ga0.5As alloys and ordered (AlAs)n(GaAs)n superlattices through a series expansion in multi-atom interaction energies obtained from the local-density formalism. We find that the alloy is more stable than the monolayer (n=1) superlattice at all temperatures, but it could order into longer-period (n≥2) superlattices below a critical temperature T(n,G) calculated for various growth orientations G. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.61.1505
DOI:
10.1103/PhysRevLett.61.1505
PACS:
64.70.Kb, 64.60.My, 68.55.Rt
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