1 - 10 of 13 articles
The effect on the ratio of the gap to the critical temperature 2Δ0/k
of various possible shapes for the electron-phonon spectral density is studied. The calculations are carried out keepingT
/ωln fixed, where ωln is a characteristic phonon energy. When only realistic shapes...
The attenuation of sound was measured in3He-4He mixtures with3He concentrations ranging from 2.89 to 8.03% at pressures of 10 and 20 bar. The quasiparticle interaction potentials were then determined at each pressure by analyzing the sound attenuation data. The superfluid transition temperature...
The problem of localized single-particle excitations and the density of states (DOS) for an inhomogeneous system consisting of a spherical superconductor (with radius a and order parameter Δ1) embedded in another superconductor (order parameter Δ2) of infinite size is considered. With the...
Standing spin-wave modes in liquid3He have been studied by cw NMR at Larmor frequencies of 1, 2, and 4 MHz and pressures of 0, 6.3, and 12.3 bar. The spin waves, which produce peaks in the NMR line, are visible at temperatures below 5 mK at zero pressure. With the assumption of a slightly...
Measurements of the magnetic Kapitza resistance between single crystals of CMN and lanthanum-diluted CMN in contact with ultrapure liquid3He are presented. The investigations were performed in the temperature range 2–100 mK and in magnetic fields up to 600 Oe. For the first time, a magnetic...
It is shown that, at low temperature and high polarization, a spin-1/2 Fermi system becomes a mixture of a degenerate fluid (up spins) and a fluid described by Boltzmann statistics (down spins). The down spins become classical when the polarization is so high that their Fermi energy becomes much...
An analysis is made of recent extensive National Bureau of Standards spin-pressure-modulation data, of increased accuracy and precision, along isochores of paramagnetic solid
He in the absence and presence of an externally applied constant and uniform magnetic field of strength up to 8 T. This...
The electron-electron scattering contribution to the ultrasonic attenuation in potassium at low temperatures is evaluated using the Landau Fermi liquid theory. The scattering function is evaluated using the approximation suggested by MacDonald and Geldart. The results are compared with...
The surface tension of liquid3He and4He was measured near the gas-liquid critical points in the reduced temperature range 3×10−4
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