Phase transitions in AlAs/GaAs superlattices under high pressure
- 23 February 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 58 (8), 781-784
- https://doi.org/10.1103/physrevlett.58.781
Abstract
Pressure-induced structural transition in AlAs/GaAs superlattices and in a bulk film of AlAs are reported for the first time. For layers thicker than a few hundred angstroms, the transition occurs in individual AlAs layers, superpressed above the bulk stability limit, with a volume change that destroys the interface coherence. However, for layers thinner than 100 Å the volume change is partially accommodated by formation of a strained-layer superlattice. The stability of strained high-pressure phases is explored with use of density-functional calculations.Keywords
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