NDLI: Influence of Ortho-H$_{2}$ Clusters on the Mechanical Properties of Solid Para-H$

Content Provider	Springer Nature Link
Author	Clark, A. C. Cheng, Z. G. Bowne, M. Lin, X. Chan, M. H. W.
Copyright Year	2009
Abstract	The quantum diffusion of ortho-H$_{2}$ impurities in solid para-H$_{2}$ has been investigated with a torsional oscillator technique. The unclustering dynamics of agglomerated impurities with increasing temperature are found to greatly affect the resonant period of oscillation. Based on the observed trends in both experimental data and complementary finite element calculations, we find that the oscillation period predominantly reflects changes in the solid’s elastic response to the minute inertial stresses imposed on it. It is likely that the small but abrupt increase in the resonant period observed above 100 mK in high purity H$_{2}$ samples is due to the interplay between remnant ortho-H$_{2}$ impurities and dislocations, and not a signature of a supersolid to normal solid transition.
Starting Page	867
Ending Page	881
Page Count	15
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	158
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2009-11-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Defects and impurities in crystals; microstructure Indirect evidence of dislocations and other defects Point defects and defect clusters Interaction between different crystal defects; gettering effect Elastic moduli Molecular hydrogen and isotopes Other supersolids Magnetism, Magnetic Materials Characterization and Evaluation of Materials Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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