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The thermal conductivity κ and the associated relaxation time τ to reach steady-state conditions are reported for the normal phase of several very dilute mixtures of3He in4He (X<4 × 10−6) at saturated vapor pressure near Tλ. The measurements were made over the reduced temperature range 2.5 ×...
Numerical simulation techniques are used to investigate the frequency dependence of the noise of the hysteretic rf SQUID up to frequencies on the order ofR/L. An exact lower bound for the noise of the instrument is given as a function of the parameters of the SQUID ring, pump frequency, and the...
The current-induced breakdown of superconductivity in whiskers from the In-Pb system has been investigated. For indium-rich alloys the characteristics show the well-known voltage step structure due to the appearance of phase-slip centers. From the linear portion following the first voltage step...
As part of a program of developing Cu-Nb3Sn composite superconductors through in situ techniques, systematic investigations have been performed on Cu-Nb composites containing niobium up to 30 at %. These alloys, prepared by an arc melting technique, show excellent filamentary morphology when...
Measurements of the average thermal conductivity κexp ≡hQ/ΔT and of the thermal relaxation time τ to reach steady-state equilibrium conditions are reported in the superfluid phase for dilute mixtures of3He in4He. Hereh is the cell height,Q is the heat flux, andΔT is the temperature difference...
The long-time heat release in amorphous Co69Fe4.5Cr2Si2.5B22 and Fe80B14Si6 after cooling fromT
1≤292 K) toT
0=1.3 K was measured. The power released is proportional tot
−1 (0.5≤t≤60 hr). At lowT
1, the experimental results are in good agreement with the standard tunneling theory. The...
Perfect surfaces were prepared by laser annealing of Si in situ at an ambient temperature of 1 K. Gold atoms were deposited onto these surfaces by using a laser-evaporation technique. At the same time, the anomalous Kapitza transmission was probed by measuring the phonon reflection at these...
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