A study has been made of the magnetic-coupling properties of vortex arrays in a dc superconducting transformer compost' of two oxygen-doped aluminum films separated by a thin insulating layer. By doping to the appropriate level, very small depixming cu-awaits have been achieved, making possible an investigation of the vortex~upling characteristics in a low-current regime free of heating instabilities. Measurements of the system's V-I characteristics have been obtained at currents more than an order of magnitude greater than the current at which the two vortex lattices cease to move at the same velocity. A simple periodic-coupling-force model has been used to generate theoretical V-I curves which are found to compare well with the experimental data Values of the magnetic interaction force coupling the two vortex arrays have been determined as a function of temperature and intervortex spacing, and are compared with theory.
The specific heats of solid neon and xenon have been measured in the temperature range 1.5 to 24°K, using a calorimeter with a mechanical heat switch. Carbon resistance thermometers were calibrated against a gas thermometer and the helium vapor-pressure scale. The results were analyzed to obtain the temperature dependence of the Debye temperature, в с (Г). In the range 0.020<Г/в 0 с <0.505, the data were fitted with an expression of the form В с (Т)=во с +АТ 2 ,where G 0 C is the Debye temperature at 0°K. This procedure gave 0 o c =74.6dbl.O°K for neon and е 0 с = 64.0±0.8°К for xenon. The results for в с (Т) are compared with the calculations of Bernardes, Horton, and Leech, and Barron and Klein, based on Mie-Lennard-Jones potentials for the interaction energy between two atoms. Tables of the following smoothed thermodynamic properties between 1.0 and 24°K are given in Table I: specific heat at constant pressure, specific heat at constant volume, entropy, and enthalpy.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.