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nuclear magnetic resonance pulse sequences have been applied to solid hydrogen for ortho concentrations <0.5. Below 1 K for τ longer than the free induction decay time we have observed multiple echoes quantitatively obeying the theory due to K. J. Packer.
The dispersion relations for the high-frequency modes in3He-B are obtained for finite temperature and including Fermi liquid corrections. The coupling between zero sound and the squashing mode is studied in detail. It is shown to have a more complicated structure than what was previously...
It was found experimentally that two stages exist in the amplitude dependence of ultrasonic attenuation in metallic glasses at low temperatures. One stage occurs at relatively small amplitudes and is followed by another stage at higher amplitudes. This clarifies the reason for two types of...
Coherent electric echo magnitudes and decay rates have been studied in gamma-irradiated natural quartz crystals in the 5–25 mK range at a frequency of 360 MHz. The echo experiments indicate the presence of two kinds of paraelectric centers. The dynamics of the two-level systems associated with...
The magnetic field dependences of the Leggett angle, the susceptibility, the free energy, and the longitudinal NMR frequency of3He-B are calculated from a generalized weak coupling theory. Employing the experimental values for the Landau parametersF
, reasonable agreement with...
A hydrodynamic analysis of rotation experiments with superfluid helium shows that strong vortex interaction with the boundary must be included for the correct prediction of observed transients during spinup. It also appears that vorticity is created at a smooth boundary at the rate necessary to...
We report an experiment in which superfluid flow through a single 10-µm diameter orifice is examined at pressure heads as low as 0.03 dyne/cm2. Accurate measurements of low pressure head are made possible by a recirculating flow cryostat, capable of generating a calibrated, continuous flow of...
We report on an evaluation ofH
c2 anisotropy effects in arbitrary planes and directions of cubic superconductors. Using Mercator projections, information on the three-dimensional variation ofH
c2 is obtained. The results are discussed for the three main crystallographic planes of the cubic...
Effective elastic coefficients for a normal Fermi liquid at finite frequency ω and wave vectorq are calculated microscopically from the Landau kinetic equation. We find in general that there are three elastic moduli in a normal Fermi liquid. One is just the usual bulk modulus and the other two...
We present measurements of the transition temperature and upper parallel critical field, to 15 kG, of layered Nb-Ti alloys for layer wavelengths between 6 and 6250 Å.
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