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Permanent link (DOI): https://doi.org/10.7939/R3GS9J

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Pressure gradients and annealing effects in solid helium-4 Open Access

Descriptions

Other title
Subject/Keyword
pressure gradients
defects
helium-4
activation energy
annealing
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Suhel, Abdul
Supervisor and department
Beamish, John (Physics)
Examining committee member and department
Marsiglio, Frank (Physics)
Beamish, John (Physics)
Jaeger, Wolfgang (Chemistry)
Freeman, Mark (Physics)
Department
Department of Physics
Specialization

Date accepted
2010-12-08T21:06:34Z
Graduation date
2011-06
Degree
Master of Science
Degree level
Master's
Abstract
The Kim and Chan experiment in 2004 gave the first experimental evidence of a possible supersolid state. Even though the origin of this state is not clear yet, several experimental and theoretical investigations suggest defects are responsible for this curious phase. We have used heat pulses and thermal quenching to study pressure gradients and annealing mechanisms in solid 4He crystals. Large pressure gradients exist in crystals grown at constant volume. These can be enhanced by phase transitions, thermal quenching or by partial melting. Annealing reduces defect densities and hence pressure gradients in crystals. Our measurements show that the pressure at different points in a crystal can behave differently, even if there is little change in the crystal’s average pressure. We measured the activation energy that is associated with the annealing process.
Language
English
DOI
doi:10.7939/R3GS9J
Rights
License granted by Abdul Suhel (suhel@ualberta.ca) on 2010-12-07T20:12:32Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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