Okamoto, Yoshiko Ohmi, Tetsuo
Published in
Journal of Low Temperature Physics

In pulsed NMR experiments on U2D2 solid3He it has been observed that in some cases free induction signals decay very quickly. It was also found that in such cases a large negative frequency shift from the Larmor frequency appears. We investigated the mechanism of this anomalous nuclear spin relaxation theoretically, using the Holstein-Primakoff met...

Mullin, William J.
Published in
Journal of Low Temperature Physics

We examine the possibility of Bose-Einstein condensation (BEC) in two-dimensional (2D) system of interacting particles in a trap. We use a self-consistent mean-field theory of Bose particles interacting by a contact interaction in the Popov and WKB approximations. The equations show that the normal state has a phase transition at some critical temp...

Herrmannsdörfer, T. Rehmann, S. Seibold, M. Pobell, F.
Published in
Journal of Low Temperature Physics

The ratio of nuclear saturation magnetization and superconducting critical field, μ0Msat/ BS0*≡∈, classifies the strength of mutual influence of nuclear magnetism and superconductivity. In order to investigate the interplay of both phenomena for the three distinct cases ∈ ≪ 1, ∈ ≍ 1, and ∈ ≫ 1 we have measured the ac susceptibility of Al, of the in...

Golov, A. Obara, K. Ikegami, H. Akimoto, H. Ishimoto, H.
Published in
Journal of Low Temperature Physics

We have measured the mobility of positive ions (“snowballs”) in liquid3He at magnetic fields H = 0 − 12 T and temperatures T = 0.3 − 10 mK. In normal3He, with increasing magnetic field the mobility first increases and then decreases nearly quadratically. The initial rise of the mobility is most strongly seen at the lowest temperatures (T = 2.5−3 mK...

Whitaker, D. L. Weilert, M. A. Vicente, C. L. Maris, H. J. Seidel, G. M.
Published in
Journal of Low Temperature Physics

We report on an experimental study of the shape oscillations of charged helium drops levitated with a magnetic field. Shape oscillations are excited with an AC electric field. Many different modes of oscillation of the drop are observable. The resonant frequencies of the drops are found to be a function of amplitude. Quantitative measurements of th...

Shirahama, Keiya Kirichek, Oleg I. Kono, Kimitoshi
Published in
Journal of Low Temperature Physics

We have measured the conductivity of the 2D electron crystal (the Wigner solid) trapped on the free surface of superfluid3He-B down to 230 μK. The resistance R(T) greatly decreases as temperature T decreases, obeying Arrhenius' law, R(T) ∝ exp (−Δ(T)/kBT), with Δ(T) which we assign to the superfluid energy gap. This reveals that the scattering of3H...

Zimmermann, W. Jr. Lindensmith, C. A. Flaten, J. A.
Published in
Journal of Low Temperature Physics

An analysis has been made of phase-slip and critical-velocity data for both the ac and dc flow of superfluid4He through a 2 μm by 2 μm aperture in a 0.1-μm-thick titanium foil between 0.36 and 2.10 K. Single-2π phase slips were resolvable over the entire range of temperature in the ac flow measurements, carried out between 10 and 20 Hz, making it p...

Dimeo, R.M. Sokol, P.E. Anderson, C.R. Stirling, W.G. Adams, M.A.
Published in
Journal of Low Temperature Physics

Inelastic neutron scattering has been used to probe the collective excitations of superfluid helium confined to silica aerogel. Confinement in porous aerogel results in a crossover behavior in the temperature dependence of the roton where the energy is relatively temperature independent below 1.9 K and strongly temperature dependent above 1.9 K. As...

Biermann, S. Hohl, D. Marx, D.
Published in
Journal of Low Temperature Physics

We present a combined path integral molecular dynamics density functional study of high density hydrogen at T=50 K and rs=1.5 (corresponding to a pressure of about 1.5 Mbar). The effects of the proton quantum character are included beyond the usual harmonic approximations in a finite-temperature ab initio calculation. The ground state structure in ...

Lilly, M. P. Hallock, R. B.
Published in
Journal of Low Temperature Physics

Adding and removing4He from an experimental cell which contains the porous material Nuclepore results in capillary condensation, hysteresis and avalanches. The volume of liquid in the nearly cylindrical pores is monitored with a capacitance technique. For the situation when all of the pores are full, the initial removal of4He from the cell results ...