1 - 9 of 9 articles
We have measured the viscosity, η, and the slip length, ζ, of normal and superfluid
He using a torsional oscillator with a thick sample space. We coated the oscillating surface with 2.5 layers of
He film to study how the
He thin film changes the scattering mechanism of
We have simulated the thermal response of a cylindrical thermal conductivity cell filled with liquid helium to AC and DC heat fluxes. The conductivity cell in these simulations is realistic in that it includes sidewalls and gaps, which cannot be treated analytically or in a one-dimensional...
Diffusion and localization of ultra-cold particles moving along randomly corrugated substrates is analyzed quasianalytically. The particles are either bound to the substrate or pressed to it by the external holding field. The localization length and diffusion coefficient are expressed explicitly...
A microscopic many-body analysis of Bose–Einstein condensation in a strongly interacting system of identical bosons is presented in the framework of correlated density matrix theory. With the aid of hypernetted-chain techniques and a replica ansatz for the entropy, the free energy is constructed...
A method for the solution of the problem of a superconductor in an external magnetic field is developed. The method allows to convert a three dimensional vector problem into a two dimensional surface problem. Using this method, the Meissner behaviour of thin film and bulk superconductors in an...
We present an experimental investigation of the temperature and magnetic field dependence of the elastic constants in the two stannide compounds Yb
. We find a small elastic softening of the c44
mode of ca. 2% in the normal state. The temperature dependence of...
The present study is the extension of a recent theory of high-TC
RF SQUIDs, operating in the presence of large thermal fluctuations. First, the explicit analytical expressions for the amplitudes of higher harmonics of the current circulating in a SQUID loop which are necessary for the...
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