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We report measurements of the temperature dependence of the thermal conductivity of helium in the region just above the lambda point and the critical boundary resistance on both sides of the transition. The data were obtained using a cell with a gap that was varied from 0.12 to 0.73 mm. The...
We have studied thermal gradients in thin Cu and AlMn wires, both experimentally and theoretically. In the experiments, the wires were Joule heated non-uniformly at sub-Kelvin temperatures, and the resulting temperature gradients were measured using normal metal–insulator–superconducting tunnel...
We analyze the evolution of two-band superfluidity from the weak to the strong coupling (Bardeen–Cooper–Schrieffer to Bose–Einstein condensation) limit. We find that population imbalances between the two bands can be created by tuning the intraband or interband (Josephson) interactions. In...
A new Cu0.5Tl0.5Ba2Ca3Cu4−y
(y=0, 1.0, 2.0, 3.0, 3.5) superconductor with four ZnO2 planes is reported. The structure of the material remains tetragonal for all Zn doping concentration. The substitution of Zn at CuO2 planar site was carried out following Cu0.5Tl0.5Ba2Ca3Cu4−y
Positron annihilation measurements and simulations are used to investigate doped YBCO. The results suggest that the ionic clustering effect is stronger for Fe than Al in YBCO. Fe ions suppress the superconductivity more strongly than Al at the same concentration, although both ions substitute...
BiPb-2234 bulk samples with nominal composition of the compound Bi1.7Pb0.3−x
(BSCCO) (0.025≤x≤0.10) have been prepared by the melt-quenching method. The effects of Nd substitution on the BSCCO system have been investigated by electrical resistance (R–T), scanning electron...
We describe the low-temperature magnetic susceptibilities of M
SiO4[MoO3]12×30H2O, with M = Mn, Co, Fe, and Ni. Magnetic order is visible in Mn2SiO4[MoO3]12×30H2O, possibly due at least in part to the magnetic dipole–dipole interaction, and magnetic frustration is suggested by the behavior...
We extend the one-body phase function upper bound on the superfluid fraction f
in a periodic solid (a spatially ordered supersolid) to include two-body phase correlations. The one-body current density is no longer proportional to the gradient of the one-body phase times the one-body density,...
The most careful measurements on the specific heat C(T) and dP/dT (P is the pressure, T is the temperature) are analysed using a model where the thermodynamic properties of 3He and 4He crystals are described by a sum of phonon and vacancy contributions. The analysis, in which the Debye model of...
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