Nonlinear structure-composition relationships in the Ge1-ySny/Si(100) (y<0.15) system
Abstract
The compositional dependence of the cubic lattice parameter in Ge1-ySny alloys has been revisited. Large 1000-atom supercell ab initio simulations confirm earlier theoretical predictions that indicate a positive quadratic deviation from Vegard's law, albeit with a somewhat smaller bowing coefficient, θ = 0.047 Å, than found from 64-atom cell simulations (θ = 0.063 Å). On the other hand, measurements from an extensive set of alloy samples with compositions y < 0.15 reveal a negative deviation from Vegard's law. The discrepancy with earlier experimental data, which supported the theoretical results, is traced back to an unexpected compositional dependence of the residual strain after growth on Si substrates. The experimental bowing parameter for the relaxed lattice constant of the alloys is found to be θ = -0.066 Å. Possible reasons for the disagreement between theory and experiment are discussed in detail.
- Authors:
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1100383
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 84 Journal Issue: 3; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Beeler, R., Roucka, R., Chizmeshya, A. V. G., Kouvetakis, J., and Menéndez, J. Nonlinear structure-composition relationships in the Ge1-ySny/Si(100) (y<0.15) system. United States: N. p., 2011.
Web. doi:10.1103/PhysRevB.84.035204.
Beeler, R., Roucka, R., Chizmeshya, A. V. G., Kouvetakis, J., & Menéndez, J. Nonlinear structure-composition relationships in the Ge1-ySny/Si(100) (y<0.15) system. United States. https://doi.org/10.1103/PhysRevB.84.035204
Beeler, R., Roucka, R., Chizmeshya, A. V. G., Kouvetakis, J., and Menéndez, J. Tue .
"Nonlinear structure-composition relationships in the Ge1-ySny/Si(100) (y<0.15) system". United States. https://doi.org/10.1103/PhysRevB.84.035204.
@article{osti_1100383,
title = {Nonlinear structure-composition relationships in the Ge1-ySny/Si(100) (y<0.15) system},
author = {Beeler, R. and Roucka, R. and Chizmeshya, A. V. G. and Kouvetakis, J. and Menéndez, J.},
abstractNote = {The compositional dependence of the cubic lattice parameter in Ge1-ySny alloys has been revisited. Large 1000-atom supercell ab initio simulations confirm earlier theoretical predictions that indicate a positive quadratic deviation from Vegard's law, albeit with a somewhat smaller bowing coefficient, θ = 0.047 Å, than found from 64-atom cell simulations (θ = 0.063 Å). On the other hand, measurements from an extensive set of alloy samples with compositions y < 0.15 reveal a negative deviation from Vegard's law. The discrepancy with earlier experimental data, which supported the theoretical results, is traced back to an unexpected compositional dependence of the residual strain after growth on Si substrates. The experimental bowing parameter for the relaxed lattice constant of the alloys is found to be θ = -0.066 Å. Possible reasons for the disagreement between theory and experiment are discussed in detail.},
doi = {10.1103/PhysRevB.84.035204},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 3,
volume = 84,
place = {United States},
year = {Tue Jul 26 00:00:00 EDT 2011},
month = {Tue Jul 26 00:00:00 EDT 2011}
}
https://doi.org/10.1103/PhysRevB.84.035204
Web of Science
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