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The nonlinear relation between supercurrent and superfluid velocity:js(vs)=Ρsvs (1-(vs/vc)2/3)provides a coupling mechanism between the sound and Helmholtz modes of a short cylindrical cavity closed by a superleak at the centre of one end. Appropriate nonlinear equations have been formulated and...
We analyze the dynamic structure function S(q, ω) for neutron scattering off helium films in the direction perpendicular to the substrate. “Dispersionlessmodes” that have been found in neutron diffraction experiments on helium films adsorbed on graphite powder (H. J. Lauter, H. Godfrin, and H....
The temperature dependence (5–45 K) of the absorption spectra of a Li atom doped in solid hydrogen at P=1.2 GPa is investigated using the path integral Monte Carlo (PIMC) method with a constant pressure ensemble. Higher temperature in our research range does not cause rearrangement of the...
New measurements of the roton excitations in superfluid 4He have been made using the IRIS spectrometer (energy resolution ∼20
μeV at the roton energy) at the ISIS spallation neutron source. The roton energy was determined over a temperature range of 0.56 to 1.61 K. High resolution (energy...
We have measured the specific heat vs. temperature in fields to 20 T of UPd2Al3 in order to try to determine the reason for the disagreement in the magnetic phase diagram as determined by magnetization and χ
ac vs. resistivity measurements, with the resistivity measurements showing the magnetic...
We have measured the temperature dependence of the superconductive critical magnetic field of three samples of beryllium from three different sources. The irregular geometric shape of one sample prevented a complete analysis of the data, but the data for the other two samples were well...
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