4.2 Article Proceedings Paper

The Limit of Mechanical Stability in Quantum Crystals: A Diffusion Monte Carlo Study of Solid 4He

期刊

JOURNAL OF LOW TEMPERATURE PHYSICS
卷 180, 期 1-2, 页码 20-28

出版社

SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-014-1238-x

关键词

Solid helium; Elasticity; Metastable

资金

  1. MICINN-Spain [MAT2010-18113, CSD 2007-00041, FIS2011-25275]
  2. MICINN-Spain [CSIC JAE-DOC program]
  3. Generalitat de Catalunya [2009SGR-1003]

向作者/读者索取更多资源

We present a first-principles study of the energy and elastic properties of solid helium at pressures below the range in which it is energetically stable. We find that the limit of mechanical stability in hcp He is bar, which lies significantly below the spinodal pressure found in the liquid phase (i.e., bar). Furthermore, we show that the pressure variation of the transverse and longitudinal sound velocities close to does not follow a power law of the form , in contrast to what is observed in the fluid.

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