Anomalous response of 4He confined in nanoporous media to torsional oscillation

Hitomi Yoshimura, Rama Higashino, Yoshiyuki Shibayama, Keiya Shirahama

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1 Citation (Scopus)

Abstract

The existence of "Non-Classical Rotational Inertia (NCRI)" in solid 4He below 0.2 K has been controversial and interpreted by a number of different theories. We report on torsional oscillator measurements for 4He in a nanoporous Gelsil glass, which has a network of nanopores with 3.5 nm in diameter. In addition to the usual "low-T NCRI" with an onset temperature 0.15 K, we find a larger decrease in rotational moment of inertia in a broad range of temperature from 0.2 to 1.9 K. This "high-T inertial anomaly" is accompanied with multiple dissipation peaks, but has no dependence on torsional oscillation velocity unlike the low-T NCRI. Since the high-T anomaly is observed also in confined liquid states, it originates in amorphous solid 4He layer near the pore wall. Our result shows that different types of supersolid - like phenomena, i.e. inertial anomalies, can coexist in a single 4He sample, even with genuine superfluidity of liquid 4He.

Original languageEnglish
Pages (from-to)218-227
Number of pages10
JournalJournal of Low Temperature Physics
Volume169
Issue number3-4
DOIs
Publication statusPublished - 2012 Nov 1

Keywords

  • Helium
  • Supersolid

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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