1 - 9 of 9 articles
Tensile tests show that ferroelastic loops always occur at 100–150 K, 200–250 K and room temperature in the Y1−xPrxBa2Cu3Oy samples withx=0 and 0.1 for whichT
c is 92 K and 82.5 K respectively, and the shape memory effect is always observed in the compact sample near 130 K, just similar to that...
Adsorption isotherms of para-hydrogen adsorbed on graphite foam were measured for the temperature interval of 9 to 15 K up to about 25 layers, using the standard volumetric method. From these isotherms straight lines were obtained for ln(P
0/P) as a function ofd
−3, d being the coverage. These...
We investigate the effects of a finite electronic bandwidth in a disordered superconductor by considering the current tight binding Anderson model of disorder and a mean field BCS interaction. A general relation, between the transition temperatureT
c and the disorder averaged spectral density...
Ripplons, or quantised surface waves, are known to exist on the surface of superfluid4He. We follow the work of previous authors and describe these excitations by quantising the classical expressions for the energy of such surface waves. The resulting quantum mechanical Hamiltonian consists of a...
Magnetic field penetrates in the form of flux lines or vortex thread into type-II magnetic superconductors (MSC) and induces magnetization of magnetic subsystem over a distance of an order of the London penetration depth surrounding the normal cores. When a flux line moves by, surrounding...
We have calculated the first non-linear corrections to the period shift andQ factor of a torsional oscillator containing a film of helium. To do so we have solved the Fokker Planck equation for the distribution of vortex pairs in the presence of an oscillating superfluid velocity field. The...
The resistivity of two-dimensional electrons on the surface of liquid helium can be measured using the Sommer-Tanner technique in which a rectangular array of electrodes is placed beneath the liquid surface. An ac voltage is applied to one electrode and the phase of the signal at another...
The temperature dependence of the static structure factor of superfluid4He is given an interpretation in terms of the Feynman-Cohen picture of the elementary excitations by constructing the corresponding microscopic density matrix and including the effect of three-body terms. The required...
The drag force on a sphere and a cylinder moving in HeII is considered on the basis of the full system of the two-fluid dissipative hydro-dynamical equations. It is shown, that due to the thermomechanical effect in superfluid there exists a specific correction to the drag force on a body. The...
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