Title

Critical stresses for sixge1-x strained-layer plasticity

Abstract

We have measured the temperature-dependent onset of strain relief in metastable SixGe1-x strained layers grown on Ge substrates. On the basis of these measurements, and physical arguments, we propose that strained-layer breakdown is most directly determined not by thickness and lattice mismatch, but rather by (1) an "excess" stress (the difference between that due to misfit strain and that due to dislocation line tension) and (2) temperature. With use of these parameters, observed regimes of stability and metastability are shown to be described within a simple, unified framework.

Document Type

Article

DOI

https://doi.org/10.1103/PhysRevLett.59.2455

Publication Date

1-1-1987

Journal Title

Physical Review Letters

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