Contribution of phonon and vacancion excitations to the thermodynamic properties of solid helium

Ye O. Vekhov; V. N. Grigor'ev; V. A. Maidanov; N. P. Mikhin; V. Yu Rubanskiy; S. P. Rubets; E. Ya Rudavskii; A. S. Rybalko; Ye V. Syrnikov; V. A. Tikhiy

doi:10.1063/1.2746833

Contribution of phonon and vacancion excitations to the thermodynamic properties of solid helium

Ye O. Vekhov
, V. N. Grigor'ev
, V. A. Maidanov
, N. P. Mikhin
, V. Yu Rubanskiy
, S. P. Rubets
, E. Ya Rudavskii
, A. S. Rybalko
, Ye V. Syrnikov
, V. A. Tikhiy

SNS Low Temperature and Magnets

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Precision measurements of the temperature dependence of the pressure are made on high-quality crystals of He4 and He3 - He4 solutions grown at a constant volume. The phonon and vacancion contributions to the pressure are separated on the basis of the Debye model for the phonons and the model of wide-band vacancion excitations. This approach is also used to analyze all the other available thermodynamic data for the solid pure isotopes of helium and their solutions. This yields information about the Debye temperature and vacancy activation energy, and a universal dependence of these parameters on the molar volume is found for He3, He4, and He3 - He4 solutions. The values found for the corresponding Grüneisen parameters turn out to be independent of the molar volume.

Original language	English
Pages (from-to)	635-641
Number of pages	7
Journal	Low Temperature Physics
Volume	33
Issue number	8
DOIs	https://doi.org/10.1063/1.2746833
State	Published - 2007

Funding

This study was supported in part by the Ukrainian Government Foundation for Basic Research (project 02.07.00391, contract F7.286-2001), by a Ukrainian Presidential Grant for Support of Scientific Research of Young Scientists (GP/F13/0037), and also by a grant from CRDF (UKP2-2853-KK-07).

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10.1063/1.2746833

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title = "Contribution of phonon and vacancion excitations to the thermodynamic properties of solid helium",

abstract = "Precision measurements of the temperature dependence of the pressure are made on high-quality crystals of He4 and He3 - He4 solutions grown at a constant volume. The phonon and vacancion contributions to the pressure are separated on the basis of the Debye model for the phonons and the model of wide-band vacancion excitations. This approach is also used to analyze all the other available thermodynamic data for the solid pure isotopes of helium and their solutions. This yields information about the Debye temperature and vacancy activation energy, and a universal dependence of these parameters on the molar volume is found for He3, He4, and He3 - He4 solutions. The values found for the corresponding Gr{\"u}neisen parameters turn out to be independent of the molar volume.",

author = "Vekhov, \{Ye O.\} and Grigor'ev, \{V. N.\} and Maidanov, \{V. A.\} and Mikhin, \{N. P.\} and Rubanskiy, \{V. Yu\} and Rubets, \{S. P.\} and Rudavskii, \{E. Ya\} and Rybalko, \{A. S.\} and Syrnikov, \{Ye V.\} and Tikhiy, \{V. A.\}",

year = "2007",

doi = "10.1063/1.2746833",

language = "English",

volume = "33",

pages = "635--641",

journal = "Low Temperature Physics",

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TY - JOUR

T1 - Contribution of phonon and vacancion excitations to the thermodynamic properties of solid helium

AU - Vekhov, Ye O.

AU - Grigor'ev, V. N.

AU - Maidanov, V. A.

AU - Mikhin, N. P.

AU - Rubanskiy, V. Yu

AU - Rubets, S. P.

AU - Rudavskii, E. Ya

AU - Rybalko, A. S.

AU - Syrnikov, Ye V.

AU - Tikhiy, V. A.

PY - 2007

Y1 - 2007

N2 - Precision measurements of the temperature dependence of the pressure are made on high-quality crystals of He4 and He3 - He4 solutions grown at a constant volume. The phonon and vacancion contributions to the pressure are separated on the basis of the Debye model for the phonons and the model of wide-band vacancion excitations. This approach is also used to analyze all the other available thermodynamic data for the solid pure isotopes of helium and their solutions. This yields information about the Debye temperature and vacancy activation energy, and a universal dependence of these parameters on the molar volume is found for He3, He4, and He3 - He4 solutions. The values found for the corresponding Grüneisen parameters turn out to be independent of the molar volume.

AB - Precision measurements of the temperature dependence of the pressure are made on high-quality crystals of He4 and He3 - He4 solutions grown at a constant volume. The phonon and vacancion contributions to the pressure are separated on the basis of the Debye model for the phonons and the model of wide-band vacancion excitations. This approach is also used to analyze all the other available thermodynamic data for the solid pure isotopes of helium and their solutions. This yields information about the Debye temperature and vacancy activation energy, and a universal dependence of these parameters on the molar volume is found for He3, He4, and He3 - He4 solutions. The values found for the corresponding Grüneisen parameters turn out to be independent of the molar volume.

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DO - 10.1063/1.2746833

M3 - Article

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VL - 33

SP - 635

EP - 641

JO - Low Temperature Physics

JF - Low Temperature Physics

IS - 8

ER -

Contribution of phonon and vacancion excitations to the thermodynamic properties of solid helium

Abstract

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