Boson peak in Sm-Al-Co ternary metallic glasses and its possible structural origin

Liu, Huimei; Lu, Ching Liang; Wang, Kefeng; Liu, Junming; Wang, Qing; Chen, Dong

doi:10.1088/1674-1056/19/1/017102

Chinese Phys. B

2010

DOI: 10.1088/1674-1056/19/1/017102

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Boson peak in Sm-Al-Co ternary metallic glasses and its possible structural origin

Huimei Liu¹,

Ching Liang Lu²,

Kefeng Wang³

et al.

Abstract: 刘慧美) a) , Lu Cheng-Liang(陆成亮) a) , Wang Ke-Feng(王克锋) a)b) , Liu Jun-Ming(刘俊明) a)b) † , Wang Qing(王清) c) , and Dong Chuang(董闯) c)

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Coupling of quasi-localized and phonon modes in glasses at low frequency

Duan 段,

Cai 蔡,

Ding 丁

et al. 2024

Chinese Phys. B

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Boson peak of glasses, a THz vibrational excess compared to Debye squared-frequency law, remains mysterious in condensed-matter physics and material science. It appears in many different kinds of glassy matters and is also argued to exist in damped crystals. A consensus is that boson peak originates from the coupling of the (quasi)localized non-phonon modes and the plane-wave-like phonon modes, but the coupling behavior is still not fully understood. In this paper, by modulating the content of localized modes and the frequencies of phonon modes, the coupling is clearly reflected in the localization and anharmonicity of low-frequency vibrational modes. The coupling enhances with increasing cooling rate and sample size. For finite sample size, phonon modes do not fully intrude into the low frequency to form a dense spectrum and phonon modes are not sufficiently coupled to the localized modes, thus there is no Debye level and boson peak is ill-defined. This suggestion remains valid in the presence of thermal motions induced by temperature, even though the anharmonicity comes into play. Our results point to the coupling of quasi-localized and phonon modes and its relation to the boson peak.

show abstract

Coupling of quasi-localized and phonon modes in glasses at low frequency

Duan 段,

Cai 蔡,

Ding 丁

et al. 2024

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

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Boson peak in Sm-Al-Co ternary metallic glasses and its possible structural origin

Abstract: 刘慧美) a) , Lu Cheng-Liang(陆成亮) a) , Wang Ke-Feng(王克锋) a)b) , Liu Jun-Ming(刘俊明) a)b) † , Wang Qing(王清) c) , and Dong Chuang(董闯) c)

Cited by 1 publication

References 32 publications

Coupling of quasi-localized and phonon modes in glasses at low frequency

Coupling of quasi-localized and phonon modes in glasses at low frequency

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Boson peak in Sm-Al-Co ternary metallic glasses and its possible structural origin

Abstract: 刘慧美) a) , Lu Cheng-Liang(陆成亮) a) , Wang Ke-Feng(王克锋) a)b) , Liu Jun-Ming(刘俊明) a)b) † , Wang Qing(王 清) c) , and Dong Chuang(董 闯) c)

Cited by 1 publication

References 32 publications

Coupling of quasi-localized and phonon modes in glasses at low frequency

Coupling of quasi-localized and phonon modes in glasses at low frequency

Contact Info

Product

Resources

About

Abstract: 刘慧美) a) , Lu Cheng-Liang(陆成亮) a) , Wang Ke-Feng(王克锋) a)b) , Liu Jun-Ming(刘俊明) a)b) † , Wang Qing(王清) c) , and Dong Chuang(董闯) c)