1 - 9 of 9 articles
Limiting ourselves to dirty superconductors, we study theoretically the fluctuation-induced diamagnetism above the superconducting transition. We find that the dynamical fluctuation is extremely important except in the immediate vicinity of the transition region [i.e.,T℞T
The superconducting transition temperature of a well-annealed polycrystalline sample of pure indium was determined by three different techniques. The heatcapacity and susceptibility transitions are approximately 1 mK wide and span the same temperature interval. The resistance transition is less...
A speculative roton Hamiltonian is used to calculate scattering cross sections in the two-dimensional problem. For the hard-cylinder interaction, one gets the same result as that obtained by the usual wave scattering in the high-energy limit. The variational calculation for the roton-vortex...
Sum rules are derived for dynamic structure factors for a binary solution and applied to the Woo-Tan-Massey theory of
He solutions. We demonstrate that in the long-wavelength region the effective
He quasiparticle interactionV
k contains no lineark dependence. In other words,
At high flow rates superfluid helium exhibits dissipation in that a chemical potential gradient is necessary to drive the flow. On the basis of a specific model for the cause of this behavior a detailed relationship between the chemical potential gradient and the resultant flow is derived. Some...
The molar volume of liquid3He,V(P, T), was determined from measurements of the dielectric constant over the temperature range 35–1200 mK and from the vapor pressure to 24 atm. Analytical expressions were fitted to the molar volumes in order to calculate the isobaric expansion coefficient αP, the...
Measurements are reported of the surface resistance of dirty type-II superconductors driven into the surface-sheath regime by a static magnetic field,H
0 parallel or nearly parallel to the sample surfaces and transverse to the microwave current, in which condition the latter can excite...
Dissipation along a thermally driven, flowing, superfluid helium film has been measured using an adaptation of the Keller-Hammel potential probes. These data are described by Langer-Fisher fluctuation theory, provided the velocity dependence is characteristic of vortex ring generation.
We examine the possibility of using NMR and other measurements on very weak solutions of
He in liquid
He to investigate the superfluid phase transition. It is found that even for these very weak solutions the mass (D
m) and spin (D
s) diffusion coefficients associated with the
He behave in...
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