Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Humphrey J"'
Publikováno v:
Журнал Экспериментальной и Теоретической Физики. 146:1258-1265
A series of experiments has revealed the existence of a large number (about 18) of different types of negative ions in superfluid helium-4. Despite much effort, the physical nature of these “exotic ions” has still not been determined. We discuss
Publikováno v:
Journal of Low Temperature Physics. 106:101-131
We report on the stable levitation of liquid helium drops of up to 2 cm diameter in a magnetic trap at temperatures down to 1.5 K in the earth's gravitational field. The production and properties of a magnetic trap for diamagnetic materials is discus
Publikováno v:
Physical Review Letters. 77:4840-4843
We describe experiments in which drops of liquid helium-4, as large as 2 cm in diameter, are magnetically levitated. We have found that, when two or more drops are levitated in the same magnetic trap, the drops often remain in a state of apparent con
Publikováno v:
Physical Review Letters. 105
We have measured the elasticity of high quality ultrapure $^{4}\mathrm{He}$ single crystals in the low temperature region where supersolidity is supposed to occur. At 20 mK, our results are consistent with elastic coefficients previously measured at
Publikováno v:
Physical Review Letters. 68:1563-1566
The Kapitza conductance between isotopically enriched synthetic diamond and Ti, Al, Au, and Pb has been studied using picosecond optical techniques. For Ti and Al, which have Debye temperatures roughly 1/5 of that of diamond, the measured heat flow i
Autor:
Humphrey J. Maris, Ambarish Ghosh
Publikováno v:
Physical review letters. 95(26)
We report on the observation of a new type of electron bubble in superfluid helium-4. This object appears to be larger than the normal electron bubble and is associated with the presence of quantized vortices in the liquid.
Publikováno v:
Physical Review Letters. 87
We propose that the liquid-gas spinodal line of helium 3 reaches a minimum at 0.4 K. This feature is supported by our cavitation measurements. We also show that it is consistent with extrapolations of sound velocity measurements. Speedy [J. Phys. Che
Autor:
Humphrey J. Maris
Publikováno v:
Physical Review Letters. 66:45-47
At a critical negative pressure {ital P}{sub {ital e}}, liquid {sup 3}He and {sup 4}He become macroscopically unstable. We give a theory of the critical behavior near {ital P}{sub {ital c}} and show that it is in excellent agreement with the experime
We have used a novel method to measure the attenuation and velocity of 56 GHz longitudinal phonons in GaAs over the temperature range from 50 to 300 K. The sample was a molecular-beam-epitaxy-grown layer separated from the substrate by a GaAs/AlAs mu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f596a66758cc8ad1413750f82a5f3c8
https://doi.org/10.1080/01418639408240242
https://doi.org/10.1080/01418639408240242
Publikováno v:
Czechoslovak Journal of Physics. 46:383-384
We have used high intensity ultrasonic waves to nucleate bubbles in superfluid4He at large negative pressures. Cavitation is found to be stochastic. We measured the cavitation probability as a function of the voltage applied to the ultrasonic transdu