1 - 9 of 9 articles
We first recall some basic ideas on homogeneous and heterogeneous nucleation. We then reconsider the heterogeneous nucleation of solid helium from liquid helium in the presence of walls. Recent experiments by Ruutu et al. demonstrate that the presence of walls drastically reduces the energy...
Magnetic ordering in the hyperfine enhanced nuclear ferromagnet PrNi5 was investigated in external magnetic fields up to 72 mT at temperatures from below the ordering temperature up to about 20 mK. An anisotropy of the magnetization and ac susceptibility was observed for two single crystalline...
We measured the low temperature subgap resistance of titanium nitride (superconductor, T
c=4.6 K)/highly doped silicon (degenerated semiconductor) SIN junctions, where I stands for the Schottky barrier. At low energies, the subgap conductance is enhanced due to coherent backscattering of the...
An effective two-dimensional dynamic interaction is developed which incorporates screening of electrons by plasmons and by optical phonons to discuss the nature of the pairing mechanism leading to superconductivity in layered electron doped cuprates. The system is treated as an ionic solid...
We explore the equations of state and other properties of various quantum fluids (3He, 4He, their mixtures, and H2) confined within individual carbon nanotubes. Above a threshold number of particles, N
a, the fluid density near the axis begins to grow above a negligibly small value. The...
A general model hamiltonian for hyperfine enhanced magnetic materials is presented. The use of the model is not limited only to the nuclear regime, but the model treats also situations when the strength of the exchange interaction is close to and above the threshold value. The model is solved...
Integrated thin-film dc RSQUIDs (Resistive Superconducting QUantum Interference Devices) have been developed that significantly simplify noise thermometer operation. We show theoretically that the main equations for noise thermometry deduced for rf RSQUIDs can also be applied to dc RSQUIDs. Our...
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