New Dissipation Relaxation Phenomenon in Oscillating Solid He-4

TL;DR

This paper reports the first observations of time-dependent dissipation phenomena in solid He-4, revealing complex relaxation behaviors such as exponential and logarithmic decay, hysteresis, and memory effects in a torsional oscillator.

Contribution

It introduces the first experimental study of dissipation relaxation dynamics in solid He-4 under abrupt drive changes, uncovering rich non-trivial behaviors.

Findings

Observation of exponential and logarithmic dissipation decay

Detection of hysteresis and memory effects in solid He-4

First characterization of relaxation dynamics in this system

Abstract

We describe the first observations on the time-dependent dissipation when the drive level of a torsional oscillator containing solid He-4 is abruptly changed. The relaxation of dissipation in solid He-4 shows rich dynamical behavior including exponential and logarithmic time-dependent decays, hysteresis, and memory effects.