Boson-peak-like anomaly caused by transverse phonon softening in strain glass

Shuai Ren, Hong-Xiang Zong, Xue-Fei Tao, Yong-Hao Sun, Bao-An Sun, Xue De-Zhen, Xiang-Dong Ding () and Wei-Hua Wang ()
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Shuai Ren: Chinese Academy of Sciences
Hong-Xiang Zong: Xi’an Jiaotong University
Xue-Fei Tao: Xi’an Jiaotong University
Yong-Hao Sun: Chinese Academy of Sciences
Bao-An Sun: Chinese Academy of Sciences
Xue De-Zhen: Xi’an Jiaotong University
Xiang-Dong Ding: Xi’an Jiaotong University
Wei-Hua Wang: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Strain glass is a glassy state with frozen ferroelastic/martensitic nanodomains in shape memory alloys, yet its nature remains unclear. Here, we report a glassy feature in strain glass that was thought to be only present in structural glasses. An abnormal hump is observed in strain glass around 10 K upon normalizing the specific heat by cubed temperature, similar to the boson peak in metallic glass. The simulation studies show that this boson-peak-like anomaly is caused by the phonon softening of the non-transforming matrix surrounding martensitic domains, which occurs in a transverse acoustic branch not associated with the martensitic transformation displacements. Therefore, this anomaly neither is a relic of van Hove singularity nor can be explained by other theories relying on structural disorder, while it verifies a recent theoretical model without any assumptions of disorder. This work might provide fresh insights in understanding the nature of glassy states and associated vibrational properties.

Date: 2021
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DOI: 10.1038/s41467-021-26029-w

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