322 citations · 943 across the 13 of their papers we have counts for
13 papers
Low frequency elastic measurements on solid He in Vycor using a torsional oscillator
A. D. Fefferman, J. R. Beamish, A. Haziot +1
Torsional oscillator experiments involving solid He confined in the nanoscale pores of Vycor glass showed anomalous frequency changes at temperatures below 200 mK. These were…
Dislocation networks in helium-4 crystals
A. D. Fefferman, F. Souris, A. Haziot +2
The mechanical behavior of crystals is dominated by dislocation networks, their structure and their interactions with impurities or thermal phonons. However, in classical crystals,…
Critical dislocation speed in helium-4 crystals
Ariel Haziot, Andrew Fefferman, Fabien Souris +3
Our experiments show that in He crystals, the binding of He impurities to dislocations does not necessarily imply their pinning. Indeed, in these crystals, there are two di…
The giant plasticity of a quantum crystal
Ariel Haziot, Xavier Rojas, Andrew D. Fefferman +2
When submitted to large stresses at high temperature, usual crystals may irreversibly deform. This phenomenon is known as plasticity and it is due to the motion of crystal defects…
Frequency Dependence and Dissipation in the Dynamics of Solid Helium
Oleksandr Syshchenko James Day John Beamish
Torsional oscillator experiments on solid 4He show frequency changes which suggest mass decoupling, but the onset is broad and is accompanied by a dissipation peak. We have measure…
Non-linear Elastic Response in Solid Helium: critical velocity or strain
James Day, Oleksandr Syshchenko, John Beamish
Torsional oscillator experiments show evidence of mass decoupling in solid 4He. This decoupling is amplitude dependent, suggesting a critical velocity for supersolidity. We observe…