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The temperature-dependent static magnetization of several dilute Cu(Fe) alloys with Fe concentrations between 102 and 478 ppm has been measured in fields between 1 and 200 Oe and at temperatures between 9 mK and 0.4 K. At higher temperatures and in small fields, the magnetization displays the...
The power absorbed by a surface at 0.2 K illuminated with thermal radiation from a surface at 0.9–6 K has been measured using a variety of materials for these surfaces. Also, the reduction in the absorbed power by the insertion of various thermal shields has been measured. The results are...
An expression, valid under an arbitrary phonon dispersion law ω(q), is analytically derived for the critical temperature of ordinary superconductors with weak coupling. The critical temperatureT
turns out to be strongly dependent on the nature of the phonon spectrum. The effect of the...
The longitudinal and transverse impurity spin susceptibilities are expressed exactly in terms of holomorphic self-energies. Within thes-d model these self-energies are calculated in lowest order perturbation theory thus yielding reasonable approximations for the susceptibilities valid for all...
Continuing our earlier efforts to develop a microscopic theory for physically adsorbed helium submonolayers, we address ourselves to a number of questions raised at the 1970 Symposium on Thin Helium Films and present here results of model calculations. In particular, we compare heats of...
The heat capacityC
of a Bose fluid immediately above its λ point is shown to depend solely on the nature of its low-momentum quasiparticles. If these quasiparticles are only weakly interacting, then it is possible to specify uniquely the limiting behaviorC
) from a knowledge of...
Resistance-vs.-temperature measurements were made on a series of beryllium films condensed on liquid-helium cooled surfaces. Two vapor sources designed to reduce contamination were used and films were prepared on both crystalline quartz and glass substrates. The samples were superconducting with...
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