Elastic Anomalies of Crystalline 4He at T=0

被引：3

作者：

Pessoa, Renato ^{[1
]}

de Koning, M. ^{[2
]}

Vitiello, S. A. ^{[2
]}

机构：

[1] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go, Brazil

[2] Univ Estadual Campinas UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2013年 / 173卷 / 3-4期

基金：

巴西圣保罗研究基金会;

关键词：

Solid helium; Elastic constants; Elastic constants relations; AB-INITIO CALCULATIONS; SHADOW WAVE-FUNCTION; EQUATION-OF-STATE; MOLECULAR-DYNAMICS; SOLID HE-4; HCP HE-4; HELIUM; POTENTIALS; CONSTANTS;

D O I：

10.1007/s10909-013-0886-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Elastic constants for hcp He-4 are investigated at zero temperature, from close to the melting pressure up to 14 MPa approximately. Well known relations of these quantities are used to analyze the results. A reliable model wave function is used in the calculations. We show that the linear compressibility has a non-isotropic character in a range of densities rather than the expected isotropic behavior. A fact that suggests that the relation among elastic constants that depends on a constant value of the structure parameters ratio c/a for hcp quantum crystals should not be used to extract an elastic constant from experimental data.

引用

页码：143 / 151

页数：9

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