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The variation of electrical resistivity of thin rectangular, single crystal films of 99.9999% gallium has been investigated from 1.1° to 20°K, as a function of crystalline orientation, for thicknesses between 40 and 250 µ. As long as the ratio of the thickness to the average bulk mean free path...
The nearly-free-electron model for Fermi surfaces becomes exceedingly complicated in structures containing a relatively large number of conduction electrons per primitive cell. The complications arise from several vanishing structure factors associated with certain reciprocal lattice vectors....
Temperature gradients in superfluid helium carrying a heat current in a 13.8-mm-wide tube or in a 0.1-mm-wide slit have been measured at 0.09 m°K
It is shown that the Hartree approximation, adopted to situations in which the many-body system has a bound ground state, is suitable for obtaining a qualitative description of the structure of an adsorbed He-II film in the presence of an attractive wall potential.
Specific heat results are presented for near-monolayer films of3He,4He, and isotopic He mixtures adsorbed on Vycor porous glass in the temperature range between 1 and 4°K. In the case of the pure He monolayers and submonolayers, the specific heats depend only onT
, like a two-dimensional Debye...
Recent theoretical work suggests that magnesium and lithium should be superconducting in the m°K temperature range. We have cooled samples of each of these metals to a temperature of 4 m°K, measured by a gamma-ray anisotropy thermometer. Although the magnetic field was less than 10−2 Oe, no...
The velocity of second soundu
in dilute solutions of3He in4He has been measured by a pulse, time-of-flight technique using a new type of mechanical transducer. Tables of measured values ofu
as a function of temperature between 0.03 and 0.6° K are presented for3He concentrations in the range...
A transverse temperature gradient odd in magnetic field has been observed in the presence of longitudinal temperature gradient in a thin strip of Pb + 7.5 at. % In with its plane perpendicular to the field. At 2.5°K, the ratio of the transverse to the longitudinal temperature gradient is...
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