193 citations · 249 across the 4 of their papers we have counts for
4 papers
Probing the Upper Limit of Nonclassical Rotational Inertia
Ann Sophie C. Rittner, John D. Reppy
We study the effect of confinement on solid 4-He's nonclassical rotational inertia (NCRI) in a torsional oscillator by constraining it to narrow annular cells of various widths. Th…
Annealing in solid He
Ann Sophie C. Rittner, John D. Reppy
We have used a torsional oscillator with square cross section and a resonance frequency of 185 Hz to confirm the nonclassical rotational inertia (NCRI) discovered by Kim and Chan\c…
Disorder and the Supersolid State of Solid He
Ann Sophie C. Rittner, John D. Reppy
We report torsional oscillator supersolid studies of highly disordered samples of solid He. In an attempt to approach the amorphous or glassy state of the solid, we prepare our…
Observation of Classical Rotational Inertia and Nonclassical Supersolid Signals in Solid 4He below 250 mK
Ann Sophie C. Rittner, John D. Reppy
We have confirmed the existence, as first reported by Kim and Chan, of a supersolid state in solid 4He at temperatures below 250 mK. We have employed a torsional oscillator cell wi…