Journal
PHYSICAL REVIEW B
Volume 80, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.224516
Keywords
current density; solid helium; statistical analysis
Funding
- NSF [DMR-060584, PHY-0758104]
- CCMR [NSF DMR-0520404]
- MEST/KOSEF
- Division Of Physics
- Direct For Mathematical & Physical Scien [0758104] Funding Source: National Science Foundation
Ask authors/readers for more resources
We apply a low-frequency (mHz) ac pressure gradient to a sample of solid helium in order to search for a superfluidlike response. Our results are consistent with zero supersolid flow. Through a statistical analysis of our data, we set a bound on the rate of mass flow between two chambers, and hence the mass current density j. At the 68% confidence level, we bound v equivalent to j/rho < 9.6x10(-4) nm/s for the mass transport velocity. In terms of a simple model for the supersolid, we find an upper bound of 8.4x10(-6) for the supersolid fraction at 25 mK, at this same confidence level. These findings force the conclusion that the NCRI observed in the torsional oscillator experiments is not evidence for a frequency-independent superfluidlike state. Supersolid behavior is a frequency-dependent phenomenon, clearly evident at frequencies above 100 Hz of the torsional oscillator experiments, but undetectably small at frequencies approaching zero.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available