A Study of the Electric Response of He II at the Excitation of Second Sound Waves

TL;DR

This paper experimentally investigates the electric response of superfluid helium (He II) during second sound wave excitation, confirming electric potential resonance and proposing a detection method, with results aligning qualitatively with prior studies.

Contribution

It provides new experimental evidence of electric potential resonance in He II and introduces a method to distinguish true signals from noise during measurements.

Findings

Electric potential appears during second sound oscillations.

Resonance observed in the first four harmonics.

Method to differentiate resonance from spurious signals.

Abstract

We report an experimental investigation of the electric response of superfluid helium. Our results confirm the presence of electric potential that appears at the relative oscillatory motion of normal fluid and superfluid components in helium generated by the heater. The resonance of the electric potential was observed in the first four harmonics. A suggested method for the detection of the electric response allows the required resonance peak to be distinguished from spurious signals. Our results are in qualitative agreement with the data published by previous researchers. The reasons for the discrepancy in the measured values of the potential difference are discussed.