1 - 10 of 12 articles
We study the thermodynamic phases of a Bose gas of spin-1/2 atoms in the Hartree-Fock approximation. Our main result is that, for repulsive or weakly attractive inter-component interaction strength, the superfluid and ferromagnetic phase transitions occur at the same temperature. For strongly...
Vapour pressure isotherms and X-ray diffraction patterns have been measured for Ar and N
2 condensed into mesoporous Si. The chemical potential–temperature phase diagram has been established in the triple point region.
We have measured the contact angle of the 3He–4He interface on a sapphire window in the temperature range from 50 to 845 mK. Contrary to what had been found by Ueno et al. in two successive experiments, we have found complete wetting by the 4He-rich phase. Our new results have two consequences:...
Bi–Pb–Gd–Sr–Ca–Cu–O bulk samples with nominal composition Bi1.7Pb 0.3-x
(x=0.01, 0.05, 0.075, 0.10) were prepared by the melt-quenching method. The effects of different Gd doping on the structure have been investigated by electrical resistance, scanning electron micrographs,...
We study the magnetic properties of a superconductor in a crystal without
$$z \rightarrow -z$$
symmetry, in particular how the lack of this symmetry exhibits itself. We show that, though the penetration depth itself shows no such effect, for suitable orientation of magnetic field, there is a...
Stationary states of two coupled Bose-Einstein condensates (BECs) in trap potentials with a localized impurity are obtained by the variational approach, and effects of the impurity on the stationary states and the characteristics of the two coupled BECs are discussed by performing a standard...
We investigate the effect of tuning the phonon energy on the correlation effects in models of electron–phonon interactions using DMFT. In the regime where itinerant electrons, instantaneous electron–phonon driven correlations and static distortions compete on similar energy scales, we find...
It is suggested that microscopic vortex rings (MVR) play an important role in the λ-transition in helium-II and substantially determine the value of T
λ. For very thin films of He-II, with thickness d less than the size of the smallest MVR, the rings do not fit in and, therefore, do not exist in...
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