Nonlinear structure-composition relationships in the Ge1-ySny/Si(100) (y<0.15) system

Beeler, R.; Roucka, R.; Chizmeshya, A. V. G.; Kouvetakis, J.; Menéndez, J.

doi:10.1103/PhysRevB.84.035204

Title: Nonlinear structure-composition relationships in the Ge_1-ySn_y/Si(100) (y<0.15) system

Journal Article · Tue Jul 26 00:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.84.035204· OSTI ID:1100383

Beeler, R.; Roucka, R.; Chizmeshya, A. V. G.; Kouvetakis, J.; Menéndez, J.

The compositional dependence of the cubic lattice parameter in Ge_1-ySn_y 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.

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Sponsoring Organization:: USDOE

OSTI ID:: 1100383

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Vol. 84 Journal Issue: 3; ISSN 1098-0121

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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References (36)

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