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Elastic Modulus of the (GaA.s)m(A.l A.s)n Superlattices

Published online by Cambridge University Press:  01 January 1992

Vadim Yu. Mirovitskii
Vadim Yu. Mirovitskii*
Affiliation:
Institute for Power Engineering, Academy of Sciences of Moldova, Grosul Str. 5, Kishinev 277026, Moldova, (USSR)
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Abstract

The ultrathin (GaAs)m (AlAs)n superlattices ( SL ) grown along [001] are formally considered as a result, of ordering-type phase transition from an initial hypothetical mixed crystal (Gax Al1-x)As with x = m/(m+n) . From this point of view changes of elastic modulus tensor (EMT) induced by ordering can he calculated nearly in a spirit of phenomenological Landau theory of second-order phase transitions. It .is shown that a change of EMT component. S66 is completely determined by symmetry properties of two translational (Dzyaloshinskji) invariants of m+n power .in the expansion of SL thermodynamic potential in a power series .in order parameter components. The changes of the other EMT components depend on the second power of order parameter .The expressions are found out to connect. EMT of a definite ordered phase (SL - family with m+n = 3) with that, of the initial one.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 291: Symposium O – Materials Theory and Modeling , 1992 , 315
Copyright
Copyright © Materials Research Society 1993

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References

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