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This paper presents the results of the dislocation amlitude-dependent ultrasonic attenuation studies in normal and superconducting indium. The measurements were taken by the pulse method with longitudinal oscillations of 7.5 Mcs/sec. Amplitude-dependent attenuation is represented by a saturation...
The conductivity of the metal in the vicinity of the superconductivity transition point has been obtained. The nonlinear fluctuation effects change the temperature dependence of the conductivity in a wide range of temperatures, in which fluctuation corrections to thermodynamic quantities are...
The results of measurements of adsorption isotherms are given for
He, Ar, and N
on bare exfoliated graphite (“Grafoil”) and for
He on Grafoil covered with a monolayer of argon. The temperatures employed were 77.3 K for the argon and N
, and the range 4.2–18.55 K for the4He. The pressure...
Piston-displacement equation-of-state (EOS) data to 20 kbar which are consistent with existingP=0 thermal expansion and bulk modulus data are given for solid neon for three isotherms (4.2, 13.5, and 19.9 K). A Mie-Grüneisen EOS can be used to correlate these results with data from directC
A theoretical and experimental study has been made of the critical current of Nb3Sn tapes prepared by different methods as a function of direction and magnitude of the applied transverse magnetic field. For different orientations of the magnetic field with respect to the crystal grains the...
New rate measurements of the flow of the saturated helium film out of a Pyrex beaker, employing a capacitance depth gauge technique, have been obtained. The high resolution has allowed us to observe the occurrence of transitions as small as1 1/2% of the flow rate. Such transitions are much...
Direct measurements of the constant volume specific heatC
are reported for solid natural neon at several molar volumes (13.39–12.39 cm3/mole) at temperatures from 1 K to the melting line. All samples were solidified in a high-pressure bomb at the melting line (maximum conditions of 53 K and...
The superfluid density in
He was determined near Tλ from the second-sound velocity as a function of Tλ−T and pressure. The critical exponent of the superfluid density was found to depend, even slightly, on the pressure. Furthermore, the fundamental length ξ
in the coherence length ξ=ξ
The resistive transitions aboveH
on Al films with the thicknessd<ξ(0) have been measured as a function of the angle ϑ between the film surface and the magnetic field, where ξ(0) is the coherence length at 0 K. An observed broadness in the transitions is considered to be due to fluctuations...
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