2024

Mass and force-constant disorder in the rocksalt Cd1−𝑥 Zn𝑥 O alloy: A Raman scattering study

28 de August de 2024

Cuscó, R., Yeste, J., & Muñoz-Sanjosé, V. (2024). Mass and force-constant disorder in the rocksalt O alloy: A Raman scattering study. Physical Review B, 110(7), 75202. https://doi.org/10.1103/PhysRevB.110.075202

Abstract

We present a Raman scattering study of rocksalt Cd1−𝑥⁢Zn𝑥⁢O alloys in the compositional range between 𝑥=0 and 𝑥=0.1. We use the sharp feature in the second-order Raman spectra associated with the transverse acoustic (TA) modes at the 𝐿 point to monitor the effect of alloy disorder on the phonon lifetime. The 2⁢TA⁡(𝐿) peak shows a substantial broadening as the Zn content is increased up to 10%. The rate of increase is significantly higher than that expected from cationic mass fluctuation as predicted by the mean-field coherent potential approximation. Excellent agreement with the experiment is achieved by including the effect of the force-constant fluctuations using the itinerant coherent potential approximation, demonstrating the significant role of the force-constant disorder in limiting the phonon lifetime in the Cd1−𝑥⁢Zn𝑥⁢O alloys.

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