DOI: 10.1063/1.1343074. Vibrational density of states of selenium through the glass transition

Vibrational density of states of selenium through the glass transition

10.1063/1.1343074

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

We present an investigation of the vibrational density of states (VDOS) of selenium calculated using two different methods. First we compute the VDOS from the velocity autocorrelation and study its evolution with the temperature. Secondly we compute it from the dynamical matrix. This latter method leads to imaginary frequencies for finite temperatures. In the literature these frequencies are called unstable and are related to the diffusion and/or the anharmonicity. We investigate the character of these frequencies, asking whether they are localized or extended, more acoustic or optic. We show that, below a temperature-dependent threshold frequency, they are similar to their real low-frequency counterparts. The temperature evolution of the number of these modes changes at the glass transition.

Bibliography

Caprion, D., & Schober, H. R. (2001). Vibrational density of states of selenium through the glass transition. The Journal of Chemical Physics, 114(7), 3236â3242.

Authors 2

D. Caprion (first)
H. R. Schober (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 10:14 a.m.)
Deposited	1 year, 7 months ago (Feb. 5, 2024, 7:17 p.m.)
Indexed	1 month ago (July 31, 2025, 11:45 p.m.)
Issued	24 years, 6 months ago (Feb. 15, 2001)
Published	24 years, 6 months ago (Feb. 15, 2001)
Published Print	24 years, 6 months ago (Feb. 15, 2001)

Funders 0

None

BibTeX

@article{Caprion_2001, title={Vibrational density of states of selenium through the glass transition}, volume={114}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1343074}, DOI={10.1063/1.1343074}, number={7}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Caprion, D. and Schober, H. R.}, year={2001}, month=feb, pages={3236–3242} }

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  "abstract": "<jats:p>We present an investigation of the vibrational density of states (VDOS) of selenium calculated using two different methods. First we compute the VDOS from the velocity autocorrelation and study its evolution with the temperature. Secondly we compute it from the dynamical matrix. This latter method leads to imaginary frequencies for finite temperatures. In the literature these frequencies are called unstable and are related to the diffusion and/or the anharmonicity. We investigate the character of these frequencies, asking whether they are localized or extended, more acoustic or optic. We show that, below a temperature-dependent threshold frequency, they are similar to their real low-frequency counterparts. The temperature evolution of the number of these modes changes at the glass transition.</jats:p>",
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