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Related Experiment Videos

Memory effects in amorphous solids below 20 mK.

D Rosenberg1, P Nalbach, D D Osheroff

  • 1Department of Physics, Stanford University, Stanford, California 94305, USA.

Physical Review Letters
|June 6, 2003
PubMed
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Below 20 mK, glass capacitance shows an initial decrease during the first dc electric field sweep. Subsequent sweeps reveal a drop in dielectric constant when exceeding prior field strengths, explained by resonant pair dynamics.

Area of Science:

  • Low-temperature physics
  • Dielectric properties of amorphous solids
  • Quantum phenomena in condensed matter

Background:

  • Glass capacitance exhibits field-dependent changes below 1 K, described by Burin's dipole gap theory.
  • Previous studies focused on temperatures above 1 K, not exploring the millikelvin range.

Purpose of the Study:

  • Investigate the low-temperature dielectric behavior of glass under dc electric fields below 20 mK.
  • Characterize anomalous capacitance changes during initial and subsequent field sweeps.
  • Explore the underlying physical mechanisms responsible for the observed phenomena.

Main Methods:

  • Precise capacitance measurements of a glass sample at temperatures below 20 mK.
  • Application of a variable dc electric field.

Related Experiment Videos

  • Systematic variation of electric field sweep cycles.

    • Main Results:

    • An initial decrease in capacitance (approx. 10^-5) observed during the first dc field sweep below 20 mK.
    • Capacitance values in subsequent sweeps were higher than the initial sweep.
    • A drop in dielectric constant (approx. 10^-5) occurred when the applied field exceeded previously experienced levels.
    • Observed field dependence aligns with dipole gap theory predictions despite initial anomalies.

    Conclusions:

    • The study reveals unique, history-dependent dielectric responses in glass at millikelvin temperatures.
    • Observed anomalies are qualitatively explained by the dynamics of resonant pairs.
    • Findings suggest a departure from standard dipole gap theory under specific low-temperature, high-field conditions.