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Lattice anharmonicity and incomplete soft mode

Harvesting and use of solar energy as an alternate source of green energy has generated renewed interest in fundamental research on optoelectronic conversion. Before using the material for making an optoelectronic device, it is essential to check the stability of the material under the external environment (pressure, temperature, etc.). In this work, temperature-dependent Raman scattering measurement demonstrates softening of certain Raman modes, which however remains incomplete as the modes do not reach zero. We propose that the onset of a new structure scatters the soft phonon modes and hence leads to incomplete soft mode behaviour. The presence of strong electron-phonon coupling, which hampers device performance, is also discussed in detail. Reference: Debabrata Samanta, Aritra Mazumder, Sonu Pratap Chaudhary, Bishnupada Ghosh, Pinku Saha, Sayan Bhattacharyya, and Goutam Dev Mukherjee, Phys. Rev. B 108, 054104 – Published 16 August 2023

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Posted on: August 21st, 2023