1 - 10 of 12 articles
The additional conductivity due to the fluctuation of the order parameter in dirty type-II superconductors is reconsidered. It is shown that in a magnetic fieldH slightly above the upper critical field the electric conductivity is strongly anisotropic depending on the relative direction of the...
The natural minerals calcite, magnesite, and dolomite containing ∼0.1% Mn
ions have been investigated to determine their usefulness as cooling agents for adiabatic demagnetization. Cooling curves below 1°K, obtained by a series of adiabatic demagnetizations, gave characteristic temperatures:...
We present a computationally tractable version of Choquard's second-order self-consistent phonon theory and apply it by calculating selected thermodynamic properties of crystalline natural Ne and Ne22 using a Mie-Lennard-Jones nearest-neighbor central force. The model, which is shown to retain...
The possibility of holography with second sound waves in He II is investigated theoretically. The radiation pressure of the second sound deforms the liquid-gas interface and the resulting relief could serve as the hologram for the optical reconstruction. The necessary heat current densities are...
The λ-temperature of liquid He4 in an annulus was found to be independent of rotation to ±10−5 °K for ε≤35 sec−1, even if the rotating liquid is allowed only 0.5 min. in the He II state to come to rotational equilibrium. This result is in disagreement with a recent publication.
When one metallic film of a tunneling junction is in the superconducting state but the other is above its transition temperature, fluctuations in the pair field of the second film cause instantaneous Josephson currents to flow. Application of the Kubo formula to these current fluctuations yields...
We treat the spin-lattice relaxation time of nucleiT
1Iin simple metals at very low temperatures. With the help of Pauli master equation we derive a general expression forT
1Ia little more general than the well-known expression of Hebel-Slichter. The explicit expression forT
1Iin simple metals,...
Landau quantum oscillations have been observed for the first time in a high-critical-field superconductor with the β-tungsten crystal structure. The data are associated with extremal orbits on three sheets of the Fermi surface, all three resembling 〈100〉-directed cylinders. The results are...
In nuclear demagnetization, the nuclear spins can cool other systems, in particular the conduction electrons and lattice, only if there is a high degree of thermal isolation of the specimen from its surroundings. The temperature that the lattice and conduction electrons can reach depends on the...
We have studied by electron tunneling the subcritical gapless behavior of superconductingIn Bi thin films in a perpendicular magnetic field. The variation of the initial slope of the tunneling characteristics with field gives quantitative information on the variation of the pair potential and...
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