NDLI: Low T Study of PdH$_{x}$ System by Torsional Oscillator Technique: x Dependent Responses

Content Provider	Springer Nature Link
Author	Harada, Shuji Donuma, Toshiaki Araki, Hideaki Kakuta, Tomoka Nakatsuji, Ryota Mueller, Robert M. Kubota, Miru
Copyright Year	2010
Abstract	Hydrogen atoms dissolve in Pd at densities up to one H atom per Pd, which provides higher atomic H density than in solid H$_{2}$. They are known to have large diffusion coefficient due to quantum tunneling. Torsional oscillator (TO) technique is employed to investigate the phases of H in Pd, which is known to show phase boundaries at the lowest T among metal-hydrogen (MH) systems. Specific heat measurements have been performed for PdH$_{x}$ with x up to high H concentration specimens as well as studies of the resistivity study to establish the unique x−T phase diagram. We have, in addition, been performing TO experiments, in order to study the effect of atomic H intrusion and the dynamics in the PdH(D)$_{x}$ system. The TO is a well-established, powerful instrument method to investigate superfluidity and quantum vortices of liquid He, especially in thin films, as well as dislocation dynamics in solids. In our TO experiments on PdH$_{x}$ specimens have shown a resonance frequency shift for PdH$_{x}$, with 0.16≤x≤0.75 at the lowest T’s, which can be largely explained by the lattice deformation by H intrusion. This x dependent contribution has a smaller, additional change depending on x and T above ∼50 K. We will show the details of experimental data and discuss the correspondence to the phonon modes change and further possibility of studying occurrence of quantum phenomena for the hydrogen system.
Starting Page	724
Ending Page	732
Page Count	9
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	162
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2010-12-22
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogen Palladium Torsional oscillator Frequency shift Phonon modes 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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