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We show that reduced critical fields, entropies, and specific heats of superconductors, regardless of “coupling-strength,” can be fitted essentially within experimental errors by curves appropriate to a system of independent fermion quasiparticles. The analysis proceeds from the formula for the...
The differential pressure across channels has been measured as a function of the flow rate of superfluid helium for two different systems of long narrow channels in the temperature range 1.3–2.2 K. The systems were a wire-filled capillary with a 10-µm gap and a rod of porous Vycor glass with an...
The thermoelectric power of high-purity gallium single crystals, oriented along the three principal directions of the orthorhombic lattice, has been measured between 4.2 and 1.4 K by means of the superconducting potentiometer developed by Clarke. For theA andB axes the thermopower has the same...
The magnetic breakdown field between the second and third zones in zinc has been determined from measurements of the absolute amplitude of the de Haas-van Alphen oscillations of the needles by a torque method. By taking the measurements to lower magnetic field and by calculating the curvature of...
A semiphenomenological method is formulated for calculating the Fourier transforms of the few-body distribution functions—the few-phonon liquid structure functionsS
s−1)—on the basis of a functional Ansatz independent of a superposition approximation. The two-phonon functionS
Measurements are presented of the thermopowerS of pure Al and dilute Al alloys from 2 to 6 K in magnetic fields up to 20 kG. For all samples the data are consistent with the equationS(H)=A(H)T+B(H)T
, allowing a separation of the electron diffusion thermopower componentS
(H)=A(H)T from the...
Measurements of the Kapitza resistanceR
between Fe, Co, and Ni and superfluid helium in the range 1–2 K are presented. The results are in strong numerical disagreement with the Khalatnikov model. We also find thatR
depends hardly at all upon the state of mechanical deformation of the...
By doping bismuth with tellurium to increase the charge carrier density and thus speed up the slow nuclear spin-lattice relaxation the nuclear quadrupole heat capacity becomes measurable in contrast to pure bismuth. The quadrupole heat capacity is greatly influenced by doping, increasing by 64%...
The mode-mode coupling expression for the critical first-sound damping parameterD
is renormalized using scaling and consistency arguments so as to avoid factorization of fluctuations and the uncertainty about the static susceptibility of the order parameter. Our functionD(ω,T −T
λ) shows the...
The mean-square nuclear displacements 〈u
2〉, the Debye Θ's associated with the 〈u
2〉, and the Debye Θ′'s associated with the temperature derivatives of 〈u
2〉 at constant volume have been calculated for the noble gas solids Ne, Ar, Kr, and Xe as a function of temperature and volume using...
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