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Vibrating wire resonators have long been used as probes of the helium liquids. They have been employed as viscometers or thermometers over a wide temperature range and a corresponding range of mean free paths, from the hydrodynamic regime to the ballistic regime. The scattering of helium...
We have used an acoustic technique to pressurize liquid helium 4 up to 163 ± 20 bar. This is far above the liquid–solid equilibrium pressure Pm, which is 25.3 bar in the low, temperature domain, where the experiment was performed (0.05 K < T < 1 K). This is also far above 65 bar, the prediction...
Mechanical resonators, in the form of vibrating wires or torsional oscillators, have long been employed as sensors in liquid 3He and 3He–4He mixtures. The damping of resonators is due to the viscosity of the surrounding liquid which is a strong, well-known function of temperature for bulk Fermi...
We study the magnetic-field dependence of the zero-frequency electric susceptibility in glasses. Starting from the two-level tunneling systems and the nuclear spin and quadrupolar potential, we evaluate the free energy perturbatively, in terms of the quadrupolar and Zeeman energies. We find that...
We have experimentally studied the behaviour of the so-called Cooper pair pump (CPP) with three Josephson junctions, in the limit of small Josephson coupling E
. These experiments show that the CPP can be operated as a traditional turnstile device yielding a gate-induced current 2ef in...
We have fabricated three YBCO microstrip lines. One is conventional microstrip line. Two are etched periodic holes. The thickness for the microstrip lines with and without holes are 0.3 and 0.45μm, respectively. The periodic holes in the microstrip line change the microwave properties more...
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