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Effects of a 3He impurity on the Elastic Anomalies of 4He at T=0

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Abstract

Effects on the elastic constants of a system formed from 4He atoms with a 3He impurity concentration of 0.14 % are investigated in a range of densities varying from 0.029 to 0.035 Å−3. A model wave function of the shadow class is used to compute elastic constants and quantities defined through relations satisfied by them. The linear compressibility assumes the isotropic character expected for an hcp crystal with a constant value of the structure axis ratio c/a. This is in contrast with bulk 4He where an anisotropic behavior is observed.

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Acknowledgements

The authors acknowledge financial support from the Brazilian agencies FAPESP, and CAPES. Part of the computations were performed at the CENAPAD high-performance computing facility at Universidade Estadual de Campinas and at the laboratory of scientific computation of Universidade Federal de Goiás.

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Correspondence to S. A. Vitiello.

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Pessoa, R., Vitiello, S.A. Effects of a 3He impurity on the Elastic Anomalies of 4He at T=0. J Low Temp Phys 171, 315–321 (2013). https://doi.org/10.1007/s10909-012-0739-8

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