1 - 10 of 18 articles
The problem of superconductivity in a one-dimensional system is investigated by the renormalization group theory. Analytical expressions for the invariant coupling and thence the vertex function are derived from the Lie equations in the second-order renormalization. These expressions explicitly...
Microcrystalline Se and Te overgrowths having an abnormal A-1-type structure were quench-condensed at 4.2 K on fine-grained base films ofO
space group oxides vapor-quenched at the same temperature on suitable glass substrates. From measurements of the electrical resistance we found that...
The dielectric constant of seven
He mixtures has been measured in the saturated liquid phase at temperatures between 0.55 and 1.86 K. The Clausius-Mosotti function (ɛ−1)/(ɛ+2) is found to be nearly linear in concentration, especially at low temperatures. A method is described for...
Using the method of Doppler-shifted fourth sound, we have investigated the angular velocity ωc1
for the onset of vorticity, the saturated critical velocity, and the dependence of ρs/ρ onv
for4He in three different pore sizes and for three different mixtures of
Hein one of the...
In one dimension, many-body matrix elements can be calculated exactly by the transfer integral (TI) method if the wave functions are assumed to be products of single-particle functions and nearest-neighbor correlation functions. In the frame of this TI approximation the phonons can be calculated...
Measurements have been made of the specific heat of solid D
with concentrations of para-D
between approximately0.9 and6%. The measurements are an extension of previously reported results to 150 mK and to various para-D
concentrations. An anomalous specific heat is observed below 0.6 K...
The orientational structure of hcp nitrogen is investigated theoretically, using a mean-field model and the intermolecular potential of Raich and Mills. Nonquadrupolar terms in the potential are shown to be essential in understanding the observed structure. The results agree closely with x-ray...
Kinetic inductance measurements have been used to study the spatial variation of the order parameter in an amorphous Bi-Fe proximity sandwich. The kinetic inductanceL
(T) of the sandwich is inversely proportional to the spatial average of the square of the order parameter 〈|Ψ|
We report high-resolution measurements of the pressure coefficient (∂P/∂T)ρ for3He in both the one-phase and two-phase regions close to the critical point. These include data on 40 isochores over the intervals−0.1≤t≤+0.1 and−0.2≤Δρ≤+0.2, wheret=(T−T
. We have...
The high-field magnetoresistance of single-crystal lead withB along 〈001〉 was measured as a function of temperature from 1.2 to 4.2 K and was found to vary asT
,n=4.43. The results support Wagner's suggestion that the conductivity in a high magnetic field may have a temperature dependence...
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