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Eliashberg has predicted that absorption of microwaves in a superconducting film leads to an increase of the energy gap by creating a nonequilibrium quasiparticle distribution. The frequency has to exceed the inverse relaxation time for inelastic scattering. In the present paper measurements are...
The Ginzburg-Landau free energy in superfluid3He is derived from kinetic theory.
Quantum systems that obey Fermi-Dirac and Bose-Einstein statistics and that interact via “noble-gas-like” potentials are studied within the context of the quantum theorem of corresponding states. The phase diagrams for the crystalline, liquid, and gaseous phases are constructed inP*-T*-η space,...
We have studied the transverse response of3He-A for the parallel plate geometry, employing the hydrodynamics of Graham. When particle-hole symmetry is employed to set certain reactive and dissipative coefficients to zero, the four modes have frequencies ω
The amplitude-dependent ultrasonic attenuation was studied at 3.6 and 10 MHz in three annealed single crystals of tin doped with 0.0016, 0.0031, and 0.00928 at% indium. The amplitude of the pulse in each case was varied from 30 to 300 V peak to peak. The results show that the dynamic loss is...
The ten third-order elastic (TOE) constants of hexagonal cobalt, which has nearly the idealc/a value, have been evaluated using the nearest-neighbor central interaction model for hexagonal materials proposed by Ramji Rao and Srinivasan. These TOE constants have been employed to evaluate the...
The dynamic pinning model of Yamafuji and Irie is adapted to the problem of electrical dissipation in the superconductive surface sheath. The free energy of the surface flux-spot lattice and its shear modulus—quantities required by the model—are calculated. The dc current-voltage characteristics...
The nature of resistive current states in a narrow superconducting channel at temperatures close to critical is discussed on the basis of the quantum kinetic theory for a generalized electron-hole density matrix. A new physical aspect of superconductivity is revealed: The superconductor displays...
Robinson and Levy have suggested that the mechanism of “apparent screening breakdown” may be responsible for an anomalous peak observed in the attenuation of transverse ultrasonic waves in metals. We show that this mechanism is consistent with Pippard's “real metal theory” despite a recent claim...
The longitudinal magnetoacoustic effects on energy bands in the bismuth structure are investigated by using the quantum mechanical treatment which is valid at high frequencies and in strong magnetic fields. It is found that the absorption coefficient and change in sound velocity oscillate with...
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