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The strong-coupling limit of the BCS model of a finite superconductor is analyzed mathematically and the exact Bogoliubov-Valatin quasiparticle operators are found. These quasiparticle operators are “number conserving.” The coefficientsu
and the quasiparticle energy are operators rather...
Earlier theories on the velocity of longitudinal propagation of the normal superconductive interface for a wire or strip carrying a current near the critical value are modified and extended. The importance of the role of the latent heatQ
in a small elemental volume moving with the interface...
The heat capacity of solid ammonia has been measured in the temperature range 2–187 K. Contributions to the heat capacity of different kinds of molecular thermal motion are distinguished. The enthalpy of formation of orientational defects in solid NH3 is determined.
Resistivity measurements have been carried out on α-manganese and some of its transition metal alloys between 2 and 273 K. A resistance minimum, a notable characteristic of α-manganese, has been observed in agreement with other workers and found to be very dependent on a second constituent in...
Resistivity-temperature measurements have been carried out on pure manganese metal in which the β phase had been retained by quenching, and on two alloys in which the β phase was found to be stabilized at room temperature. The resistivity of β-manganese is seen to decrease monotonically with...
Adiabatic compressibilities of solidCO (20–67 K) and NH3 and ND3 (90–190 K) have been determined with an ultrasonic method. The temperature dependence of adiabatic compressibility is discussed for two groups of molecular crystals: solid inert gases (Ar, Kr, Xe, Ne) and a number of simple...
Intermediate-state magnetic flux patterns have been observed in thin superconducting films of tin, lead, and indium in perpendicular applied fields of 0.1–100 Oe. The spatial variation in flux density was measured very close to the film with a high-resolution Hall probe which could be scanned in...
Precision first-sound measurements at 17.1 kHz are presented for a 5%3He-4He solution. Measurements near the λ transition are analyzed with a modified Pippard-Buckingham-Fairbank relation using recent3He-4He heat-capacity measurements. The analysis takes into account the effects of gravity and...
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