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Strain Relief in Cu-Pd Heteroepitaxy
- Publication Year :
- 2005
- Publisher :
- American Physical Society (APS), 2005.
-
Abstract
- We present experimental and theoretical studies of Pd/Cu(100) and Cu/Pd(100) heterostructures in order to explore their structure and misfit strain relaxation. Ultrathin Pd and Cu films are grown by pulsed laser deposition at room temperature. For Pd/Cu, compressive strain is released by networks of misfit dislocations running in the [100] and [010] directions, which appear after a few monolayers already. In striking contrast, for Cu/Pd the tensile overlayer remains coherent up to about 9 ML, after which multilayer growth occurs. The strong asymmetry between tensile and compressive cases is in contradiction with continuum elasticity theory, and is also evident in the structural parameters of the strained films. Molecular Dynamics calculations based on classical many-body potentials confirm the pronounced tensile-compressive asymmetry and are in good agreement with the experimental data.<br />Comment: 4 pages, 5 figures, to appear in Phys. Rev. Lett
- Subjects :
- Condensed Matter - Materials Science
Materials science
Statistical Mechanics (cond-mat.stat-mech)
Condensed matter physics
business.industry
Physics
strain relaxation
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
General Physics and Astronomy
Heterojunction
structures
Pulsed laser deposition
Overlayer
law.invention
Optics
Compressive strength
law
Ultimate tensile strength
Monolayer
Stress relaxation
Scanning tunneling microscope
business
Condensed Matter - Statistical Mechanics
ultrathin Pd and Cu films
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....b84f7227f55c3c80a0e2a6e2621e1dc9