1 - 10 of 12 articles
The theory of sound propagation in pair-correlated Fermi liquids developed previously by Wölfle is applied to the Anderson-Brinkman-Morel state, believed to describe 3He -A. The effect of quasiparticle collisions is included. Expressions for the anisotropic sound absorption and velocity valid at...
Previous spin-fluctuation theories yielding the strong coupling corrections δ\-β
to the five coefficients of the fourth-order invariants in the free energy functional are extended. First, the superfluid part of the susceptibility is calculated up to order δ4 for all momenta and frequencies and...
Using a simple, isotropic phonon model, the contribution of optic modes to the electron-phonon coupling constant is found to exceed that of acoustic phonons only slightly. The Coulomb pseudopotential parameter Μ* is found to be rather small. The inverse isotope effect is analyzed and related to...
We report ultrasonic dispersion and attenuation measurements near the liquid-gas critical point of 3He at frequencies from 0.5 to 5.0 MHz and densities from 0.89ϱ
. The singular part of the sound attenuation and the dispersion on the critical isochore ϱ
= 0.0414 g/cm3 are...
We report the first measurements of negative ion motion in the superfluid phases of 3He and in the normal phase below 17 mK. Refrigeration was achieved with nuclear demagnetization of copper and we used a pulsed NMR platinum powder thermometer immersed in the liquid. In the A phase the...
The phonon dispersion relations along symmetry directions in cobalt have been obtained using a nearest neighbor central force model for hcp lattices. The third-order elastic (TOE) constants obtained in this model have been used to determine the changes in the lattice parameters due to high...
The physics of the solid 3He magnetic problem is reviewed. The data base includes C(T, 0), P(T, 0), P(T, H), X, S(T, 0), S(T, H), and the location of the magnetic phase transition on the melting curve. This data base permits determination of only two moments of the magnetic Hamiltonian, J
The disappearance or reentry of superconductivity at lower temperatures in disordered systems is generally only the superposition of separate and not connected effects.
With a very simple model, using the Kubo method, we treat the effect of phonons on the tunneling of a point defect in a quantum crystal and find the results of Kagan and Klinger. We concentrate on the case where spins play no part and consider in some detail the case of a vacancy in solid 4He....
Pulsed NMR measurements were performed at 10 and 20 MHz on thin 3He films on graphitic surfaces in the temperature range between 0.35 and 4.2 K. Most of the measurements reported here have been obtained with basal-plane oriented graphite (Grafoil) outgassed at 130 ‡C, but in some experiments...
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