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Using the strong coupling theory, the deviations from the BCS laws are calculated for Pb under hydrostatic pressure. The strength of the electronphonon coupling is reduced under pressure and this is manifested in the temperature variation of the reduced gap edge, dc Josephson current, and...
We have carried out Brillouin scattering experiments in superfluid 3He-4He solutions at six molar concentrations (x = 0.050, 0.100, 0.135, 0.250, 0.398, and 0.606) for temperatures as low as 0.4 K. We have measured the relative scattered intensities from the three normal modes: first sound,...
Linear thermal expansion measurements are reported for free-standing samples of solid neon at temperatures from 2 to 14 K. After normalization, the results agree well with x-ray data in an overlap region between 8 and 14 K. The T = 0 Grüneisen parameter γo = 2.58(±0.05) is in excellent agreement...
The 4He viscosity has been measured with a vibrating wire viscometer on the superfluid side of the λ transition. The results indicate that η should be singular at Tλ, in agreement with the suggestion advanced recently by G. Ahlers.
An apparatus has been developed for the deposition of evaporated films at less than 10 K and the subsequent measurement of resistance of the films between 1.5 and 300 K. In this paper results are given for the annealing on the films with emphasis on the sharp transition temperature at which...
The superfluid density tensor in 3He is studied, from the weak coupling theory, assuming that the A phase is the axial state and the B phase the isotropic state. The results could explain why the A-B transition has not been seen in fourth-sound experiments.
In order to model the core of an isolated vortex in a type II superconductor, a variational trial function for the magnitude of the normalized order parameter of the form f = ϱ/R is assumed, where ϱ is the radial coordinate, R = (p
2 + ξv
2)1/2, and ξ
is a variational core radius parameter....
Numerical calculations and measurements of the radiofrequency size effect (RFSE) in the transmission geometry are reported for potassium plates 0.1 mm thick at 1.25 MHz. The agreement between theory and experiment on the line width, line shape, and magnitude of the effect is very good for...
A self-consistent theory is presented to account for the possibility of coherent pairing between Mott and a Frenkel exciton at low temperatures in a two-level system of an organic solid. It is shown that a charge-transfer (CT) biexciton state can exist at low temperatures provided that certain...
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