Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Humphrey J"'
Autor:
Yiming Xing, Humphrey J. Maris
Publikováno v:
Journal of Low Temperature Physics. 201:634-657
We present a review of the properties of negative ions that are produced when electrons are inserted into superfluid helium-4. It is convenient to divide the ions into two groups. The first is the ion usually referred to as the “normal electron bub
Publikováno v:
Journal of Low Temperature Physics. 185:313-323
Exotic ions are negatively charged objects which have been detected in superfluid helium-4 at temperatures in the vicinity of 1 K. Mobility experiments in several different labs have revealed the existence of at least 18 such objects. These ions have
Autor:
Humphrey J. Maris, Sébastien Balibar
Publikováno v:
Journal of Low Temperature Physics
In 2004 Kim and Chan performed a torsional oscillator measurement of the rotational inertia of solid helium-4. They found frequency changes which were interpreted in terms of a non-classical rotational inertia, that is a partial superfluidity or "sup
Autor:
Humphrey J. Maris, Sébastien Balibar
Publikováno v:
Journal of Low Temperature Physics
Recent experiments have shown that the shear modulus of solid helium undergoes a large temperature variation in the range 20 to 200 mK, possibly due to changes in the pinning of dislocations. In this note we report on computer simulations of the elas
Publikováno v:
Journal of Low Temperature Physics. 159:452-461
Given the running controversies on the interpretation of supersolidity, it appears important to measure more accurately what are the properties of helium 4 crystals in the absence of disorder. We recall how to prepare single crystals with no or very
Autor:
Humphrey J. Maris, D. Jin
Publikováno v:
Journal of Low Temperature Physics. 158:317-323
We have performed computer simulations of the motion of electron bubbles through superfluid helium. The helium is modeled through the use of a modified version of the Gross-Pitaevskii equation. We find that by the time the bubble reaches the velocity
Autor:
Humphrey J. Maris
Publikováno v:
Journal of Low Temperature Physics. 155:290-302
In this note we report on simple estimates of the properties of metastable solid helium that is at a pressure below the normal melting pressure. We calculate the nucleation rate for formation of the liquid phase and estimate the “spinodal” pressu
Autor:
Humphrey J. Maris, Sébastien Balibar
Publikováno v:
Journal of Low Temperature Physics. 147:539-547
The specific heat of solid helium in the temperature range below about 1.2 K has been found to contain a term varying as T 7, in addition to the usual T 3 contribution always found in a crystalline dielectric solid. It has been proposed by Anderson,
Autor:
Humphrey J. Maris, Ambarish Ghosh
Publikováno v:
Journal of Low Temperature Physics. 134:251-256
We have perforated a series of experiments to study cavitation in superfluid helium into which electrons are injected by field-emission from a sharp tip. The injected electrons force open small cavities in the liquid (“electron bubble”). These ob
Publikováno v:
Journal of Low Temperature Physics. 134:227-235
We give a survey of recent experimental and theoretical work on the effect of light on electron bubbles in liquid helium. The light-induced change in the bubbles is measured using an ugtrasonic technique. In helium at temperatures above about 1.7 K,