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Summary: VOLUME 81, NUMBER 7 P H Y S I C A L R E V I E W L E T T E R S 17 AUGUST 1998
Kinetically Driven Growth Instability in Stressed Solids
William Barvosa-Carter* and Michael J. Aziz
Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
L. J. Gray and Theodore Kaplan
Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
(Received 10 April 1998)
We report a new stress-induced kinetically driven morphological instability for driven systems.
The effect of stress on the interfacial mobility couples to stress variations along a perturbed planar
growth front. Comparison of theory and experiment for solid phase epitaxy at a corrugated Si(001)
interface, with no free parameters, indicates that the new mechanism is required to account for
the observed growth of the corrugation amplitude. This mechanism operates in conjunction with
known diffusional and elastic strain energy-driven instabilities in determining morphological evolution.
[S0031-9007(98)06924-5]
PACS numbers: 61.50.Ks, 68.35.Bs, 68.35.Ct, 82.20.Mj
There is increasing interest in the effects of nonhydro-
static stresses on condensed phase processes such as dif-
fusion and crystal growth. The focus of most work has
been to understand and account for stress effects on the
energetics, or driving forces, for these processes, particu-
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