1 - 10 of 16 articles
We explore the influence of state-independent spatial correlations on the structure functions, the momentum distribution for given spin (-isospin) projection, and the one-body density matrix of various model Fermi fluids described by trial wave functions of Jastrow-Slater type. These and related...
We report measurements on the superconducting transition temperature T
cand the normal resistance R
nof quench-condensed pure and granular aluminum films. The changes of the superconducting transition temperature are characteristically dependent on the coating film thickness and are inversely...
The technique of McMillan-Rowell tunneling spectroscopy, extended by a method of proximity junctions to poorly oxidizing materials, is applied to study electron-phonon coupling in Nb1−x
at x = 0.25, corresponding to the maximum T
cin the Nb-Zr alloy system. The resulting α2
It is shown that the critical velocity of vortex formation V
cin helium II, as measured in oscillation experiments, is strongly distorted by the delay effect, the elimination of which removes the dependence of V
con the period, and the increase of V
con approaching the λ point is changed to a...
The flux flow viscosity coefficient b
−1 (in units of Φ0
−2) of vacuum-deposited indium thin films with low κ values (1.0–2.8) is measured at temperatures between 0.5T
cin the weak magnetic field region. At each temperature, b
−1 decreases as κ increases for κ larger than...
Results of measurements of the heat capacity of the ternary molybdenum chalcogenides PbMo6S8, and PbMo6Se8 and of samples with small Fe content PbFe
Mo6S8 (x = 0.05; 0.1) are presented and discussed. A strong decrease of T
cand increase of the γ coefficient without any change of lattice...
The dependence of the conductivity of long, “one-dimensional” samples of superconducting tin on a large bias current I has been measured using a small superposed rf current in the frequency range 30–1000 MHz. From our data we find that the order parameter relaxation time Τ
is given by τR =...
Flux flow noise is investigated on niobium foils with isolated pinning structures such as a single grain boundary or a sample edge. Local analysis of the associated electric noise field in the sample shows that noise due to fluctuations of vortex velocity originates at these pinning structures....
The temperature dependence of the carrier scattering rate in copper, silver, and gold at low temperatures has been determined from magnetoacoustic data. Both the (100) central belly orbit and the (110) “dogs-bone” orbit exhibit a T
3 dependence in all three metals. For copper and silver the...
Irradiation of a superconductor by an electromagnetic field with a frequency Ω0 larger than twice the energy gap (order parameter) decreases the order parameter δ. We obtain the quasiparticle distribution function n and the dependence of the order parameter on the power of the electromagnetic...
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