Volume 126, Number 3, May 2019
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||10 June 2019|
Bond-stretching force constants and vibrational frequencies in ternary zinc-blende alloys: A systematic comparison of (In,Ga)P, (In,Ga)As and Zn(Se,Te)
1 Institut für Festkörperphysik, Friedrich- Schiller-Universität Jena - Max-Wien-Platz 1, 07743 Jena, Germany
2 DESY Photon Science - Notkestrasse 85, 22607 Hamburg, Germany
3 Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University - Canberra ACT 0200, Australia
Received: 14 March 2019
Accepted: 10 May 2019
We present element-specific effective bond-stretching force constants and Einstein frequencies of (In,Ga)P ternary alloys determined by temperature-dependent extended x-ray absorption fine structure spectroscopy. The bond-stretching force constants of both bond species show a nearly linear composition dependence between the values of GaP and InP. In contrast, the corresponding Einstein frequencies are different for the two bond species over the whole compositional range. Furthermore, we demonstrate that the composition dependence of bond-stretching force constants and Einstein frequencies for (In,Ga)P, (In,Ga)As, and Zn(Se,Te) is mostly caused by the associated bond length changes. Remaining deviations may be explained by coupling effects between different bond species within the alloy.
PACS: 63.50.Gh – Disordered crystalline alloys / 61.05.cj – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.
© EPLA, 2019
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