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When a wire resonator is moving in superfluid3He-B at low temperature, there is a drag force due to scattering of thermally excited quasiparticles. The form of the graph of the drag force against the wire velocity depends strongly on the type of scattering at the wire surface. The force always...
We have studied the non-linear response of a helium film to an external AC drive near the Kosterlitz Thouless superfluid transition by using the theory of Ambegaokaret al. Previously we have investigated the weakly non-linear response, corresponding to a small ratio of the diffusion lengthr
The thermoelectric effect due to structural anisotropy in a layered superconductor is studied. We found that the thermoelectric magnetic field is proportional to the difference of in-plane and out-of-plane normal-state Seebeck coefficients and could be easily compared with experimental data. The...
We present sorption measurements for3He and4He in the temperature range of 1.5 K to 4.1 K, and for20Ne in the temperature range of 22 K to 27 K by crystals of C60, C70 and crystals of the mixture of these two molecules, 80% C60, 20% C70 We analyze these data by taking into account the...
The heat capacity C of a TiH1.98 bulk sample in zero and 72 mT magnetic fields has been measured at 8 mK⩽T⩽ 600 mK. In zero magnetic field the sample shows metallic behavior. In a magnetic field the protons give an additional nuclear heat capacity contribution, whose value is in good agreement...
Prompted by the recent striking experimental results reported by Babkin and Hakonen that appeared to show that liquid helium-II does not wet magnesium fluoride, we have examined the effects that an inhomogeneous electrostatic field has on thin films of liquid helium at temperatures below 0.5K....
We study in general terms the ratio2Δ/T
within Eliashberg theory of superconductivity. We point out that, in the calculation of2Δ/T
, it is possible to replace in a systematic and explicit way any boson spectrum by a two Einstein peak spectrum, without changing the result by more than a...
The upper critical fieldH
(T) of a high quality single crystal of UBe13 is studied with very low noise resistivity measurements. It shows a large but finite slope of —45 T/K, an unusual temperature dependence with an inflexion point atT/T
∼ 0.5 and a large saturated limit forT→ 0 ofH...
The Bitter decoration technique is used to study the trapping of single and multiple quanta vortices by a lattice of circular microholes. By keeping a thin superconducting layer (the bottom) inside each hole we are able to visualise the trapped vortices. From this we determine, for the first...
The transverse magnetoresistivity of tungsten single crystals with resistivity ratios of up to 80.000 was measured in the temperature range from 4.2 to 60 K and in magnetic fields up to 15 T. The experiments show that the temperature (phonon) breakdown effect occurs in compensated metals as a...
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