On anomalies of anharmonic effects for soft phonons in alkali and bcc alkali-earth metals

V. G. Vaks; G. D. Samolyuk; A. V. Trefilov

doi:10.1016/0375-9601(88)90961-9

On anomalies of anharmonic effects for soft phonons in alkali and bcc alkali-earth metals

V. G. Vaks, G. D. Samolyuk, A. V. Trefilov

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Abstract

Calculations of the anharmonic effects in alkali metals have shown that for the short-wave phonons of the soft Σ₄-branch the frequencies ω_i increase and the Grüneisen parameters γ_i sharply decrease with increasing temperature. Recent experiments for Na and Li appear to confirm these predictions. Our calculations show that in the bcc alkali-earth metals both anomalies are still more pronounced increasing in scale in the Ba-Ca-Sr series.

Original language	English
Pages (from-to)	37-42
Number of pages	6
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	127
Issue number	1
DOIs	https://doi.org/10.1016/0375-9601(88)90961-9
State	Published - Feb 1 1988
Externally published	Yes

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abstract = "Calculations of the anharmonic effects in alkali metals have shown that for the short-wave phonons of the soft Σ4-branch the frequencies ωi increase and the Gr{\"u}neisen parameters γi sharply decrease with increasing temperature. Recent experiments for Na and Li appear to confirm these predictions. Our calculations show that in the bcc alkali-earth metals both anomalies are still more pronounced increasing in scale in the Ba-Ca-Sr series.",

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AU - Samolyuk, G. D.

AU - Trefilov, A. V.

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Y1 - 1988/2/1

N2 - Calculations of the anharmonic effects in alkali metals have shown that for the short-wave phonons of the soft Σ4-branch the frequencies ωi increase and the Grüneisen parameters γi sharply decrease with increasing temperature. Recent experiments for Na and Li appear to confirm these predictions. Our calculations show that in the bcc alkali-earth metals both anomalies are still more pronounced increasing in scale in the Ba-Ca-Sr series.

AB - Calculations of the anharmonic effects in alkali metals have shown that for the short-wave phonons of the soft Σ4-branch the frequencies ωi increase and the Grüneisen parameters γi sharply decrease with increasing temperature. Recent experiments for Na and Li appear to confirm these predictions. Our calculations show that in the bcc alkali-earth metals both anomalies are still more pronounced increasing in scale in the Ba-Ca-Sr series.

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On anomalies of anharmonic effects for soft phonons in alkali and bcc alkali-earth metals

Abstract

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