1 - 10 of 11 articles
The possibility of existence of envelope solitons in dipolar coupled systems (particularly magnetic soliton in nuclear spin-system with dipole-dipole interaction) is proved. The expressions for the width, group velocity and shift of frequency of the soliton are obtained in both short and large...
Data from a series of torsional oscillator experiments performed on
He films on Mylar have been available for some time. However, up until now it was thought that disorder in the substrate leads to a wide variation in the results. Here the data is analysed in a new way which captures for the...
Condensate models for superfluid helium II with nonlocal potentials are considered. The potentials are chosen so that the models give a good fit to the Landau dispersion curve; i.e., the plot of quasi-particle energy E versus momentum p has the correct slope at the origin (giving the correct...
We have made a direct measurement of the thermal expansion of liquid
He between 1 and 200 mK at saturated vapour pressure, by measuring the change in volume as a function of temperature with a coaxial capacitive level detector. Our results do not depend on calibrations against known liquids,...
The superconducting properties of the heavy fermion UPt
have been changed by irradiation with high energy electrons which creates point defects in a reproducible and controled way. Measurements of the residual resistivity, critical temperature, upper critical field and thermal conductivity...
The superfluid Stirling refrigerator (SSR) is a Stirling machine that uses the ideal gas behavior of the
He Component of a
He mixture to provide cooling at temperatures below 2 K. The design of SSR's to date has used the Schmidt model to predict the performance of a given machine....
A pressure jump has been found at the onset of the dissolution of bcc inclusions in separated solid
He - 4
He mixture if the crystal is overheated above a certain critical value. This effect can be explained in the framework of a multistage dissolution process model.
We measure the diamagnetic response of YBa
x (A=Cl, F, H) ceramics. We obtain low-field effective penetration depths λ of a few 10 μm, first flux-penetration field H1
distinguishable from the volume penetration field HC1
and two characteristic temperatures Ts
and Tc, Tc
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