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We report a study of the inhomogeneities in thin helium films due to the van der Waals potential by a resonant acoustical technique. The van der Waals constant between helium and quartz is estimated to be α=65±5 K (layer)3; the model leads to a solid helium layer on the substrate of the order...
We report a study of transient effects in sound velocity measurements in several3He-4He mixtures near the tricritical point, from which by extrapolation we derive the equilibrium thermal concentration gradient and the thermal diffusion ratiok
. In the superfluid phase, the thermal...
The general phenomenological dispersion law for type II superconductors is presented. In addition to thermal conduction, charge fluctuation decay, and contact potential modes, it is shown that there in general exists a high-frequency propagating mode determined by the low-frequency resistance at...
From the Ginzburg-Landau equations, the order parameter, local magnetic field, supervelocity, and elastic energy are derived for an arbitrarily distorted lattice of curved or straight flux lines. Exact solutions are given for small strains and for fields close to the upper critical fieldH
Anomalies previously reported in the specific heat curve of normal-state niobium at 3 and 9.5 K prompted new measurements on single crystals of niobium, tantalum, and vanadium from their superconductingT
's up to 20 K. The upper anomaly was confirmed in Nb and found to occur at 10.3 K. At this...
We propose that He II exhibits macroscopic [σ
/N ∼O(1)] quantum zero-point motion in momentum space, i.e., that a nonzero root-mean-square superfluid velocity exists even in an equilibrium superfluid system at rest. At absolute zero, using coherent states, we relate the uncertainty σ
Elastic wave transmission at the interface between a substrate and liquid helium has been calculated using a model that takes into account the inhomogeneous character of the acoustical impedance in helium and in particular the existence of a solid helium layer intermediate between the substrate...
The susceptibility of a single crystal of antiferromagnetic uranium mononitride (T
N ≃ 53 K) is reported between 4 and 1000 K. The paramagnetic susceptibility follows a modified Curie-Weiss law with a temperature-independent susceptibility χ0=8.0×10−6 emu cm−3 added, ϑ=−247 K, and 2.66 Bohr...
Electrical resistivity measurements between 4 and 300 K on a uranium mononitride single crystal are reported. A small peak is observed at 0.25 K below the antiferromagnetic transition temperatureT
N (=52.95 K) and this is attributed to the introduction of new Brillouin zone boundaries upon...
A program for the rigorous calculation of the volume pinning force exerted by-imperfections on the flux line lattice in type II superconductors is outlined. As one step of this program, the order parameter, local magnetic field, supervelocity, and elastic energy of the distorted lattice of still...
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