2008/07/14 by Ann Sophie C. Rittner, J. D. Reppy, John D. Reppy · 2 citations
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Advanced Thermodynamic Systems and Engines #High-pressure geophysics and materials #Quantum, superfluid, helium dynamics #cond-mat.other
paper · pdf · doi:10.1103/physrevlett.101.155301
5 pages, 4 figures
arxiv created 2008/07/14 · openalex publication_date 2008/10/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the effect of confinement on solid 4He's nonclassical rotational inertia fraction (NCRIF) in a torsional oscillator by constraining it to narrow annular cells of various widths. The NCRIF exhibits an observed maximum value of 20% for annuli of approximately 100 microm width. Samples constrained to porous media or to larger geometries both have smaller NCRIF, mostly below approximately 1%. In addition, we extend the blocked-annulus experiment of Kim and Chan to solid samples with large supersolid fractions. Blocking the annulus suppresses the nonclassical decoupling from 17.1% to below the limit of our detection of 0.8%. This result demonstrates the nonlocal nature of the supersolid phenomena. At 20 mK, NCRIF depends on velocity history showing a closed hysteresis loop in different thin annular cells.