Probing phase coherence in solid helium using torsional oscillators of different path lengths

Duk Y. Kim, Joshua T. West, Tyler A. Engstrom, Norbert Mulders, Moses H.W. Chan

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Long-range phase coherence is a critical signature of macroscopic quantum phenomena. To date, nonclassical rotational inertia (NCRI) of solid helium has been reported only in samples with physical dimension of at most 5 cm. We have investigated solid helium in longer path-length torsional oscillators. Samples of length ranging from 6 to 100 cm were grown inside toroids and in self-connected long capillaries. NCRI of 4×10 -5 and 3×10 -5 were found in cells with path length of 6 and 9 cm. In cells with path length of 30 and 100 cm, NCRI, if it exists, is less than 7×10 -5 and 4×10 -5, respectively.

Original languageEnglish (US)
Article number024533
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number2
DOIs
StatePublished - Jan 24 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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