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Temperature dependence of the vacancy formation energy in solid 4He

Author
Rota, R.; Boronat, J.
Type of activity
Journal article
Journal
Crystals
Date of publication
2018-09-01
Volume
8
Number
9
First page
344-1
Last page
344-8
DOI
https://doi.org/10.3390/cryst8090344 Open in new window
Repository
http://hdl.handle.net/2117/122277 Open in new window
URL
http://www.mdpi.com/2073-4352/8/9/344 Open in new window
Abstract
We studied the thermal effects on the behavior of incommensurate solid 4He at low temperatures using the path integral Monte Carlo method. Below a certain temperature, depending on the density and the structure of the crystal, the vacancies delocalize and a finite condensate fraction appears. We calculated the vacancy formation energy as a function of the temperature and observed a behavior compatible with a two-step structure, with a gap of few K appearing at the onset temperature of off-diagon...
Citation
Rota, R., Boronat, J. Temperature dependence of the vacancy formation energy in solid 4He. "Crystals", 1 Setembre 2018, vol. 8, núm. 9, p. 344-1-344-8.
Keywords
quantum Monte Carlo, solid helium, vacancies
Group of research
SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity

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