منابع مشابه
HELIUM , SOLID 1 Helium , Solid
Helium was first solidified at the famous Kamerlingh Onnes low-temperature physics laboratories in Leiden by W. H. Keesom [1] on June 25, 1926. The initial experiments by Sir Francis Simon at Oxford University and by Keesom and their collaborators focused on the melting curve, the specific heat, and the thermal conductivity of solid helium as a test of our early understanding of solids. These m...
متن کاملHelium penetrates into silica glass and reduces its compressibility.
SiO(2) glass has a network structure with a significant amount of interstitial voids. Gas solubilities in silicates are expected to become small under high pressure due to compaction of voids. Here we show anomalous behaviour of SiO(2) glass in helium. Volume measurements clarify that SiO(2) glass is much less compressible than normal when compressed in helium, and the volume in helium at 10 GP...
متن کاملSuperflow in Solid Helium
The small mass and significant zero point motion of solid He make it very different from its conventional counterparts. In the seventies it was suggested that at very low temperatures solid helium might flow like a superfluid while remaining a crystal. This hidden “supersolid” phase was subsequently almost ruled out both by experiments and theoretical calculations. However, in 2004 Kim and Chan...
متن کاملExcitations of amorphous solid helium
We present neutron scattering measurements of the dynamic structure factor, S(Q, ω), of amorphous solid helium confined in 47 Å pore diameter MCM-41 at pressure 48.6 bar. At low temperature, T = 0.05 K, we observe S(Q, ω) of the confined quantum amorphous solid plus the bulk polycrystalline solid between the MCM-41 powder grains. No liquid-like phonon-roton modes, other sharply defined modes at...
متن کاملImpulse Approximation in Solid Helium
The incoherent dynamic form factor S/Q , to) is evaluated in solid helium for comparison with the impulse approximation (IA). The purpose is to determine the Q values for which the IA is valid for systems such as helium where the atoms interact via a potential having a steeply repulsive but not infinite hard core. For 3He, Si(Q, to) is evaluated from first principles, beginning with the pair po...
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ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2008
ISSN: 0953-8984,1361-648X
DOI: 10.1088/0953-8984/20/29/295230