Effect of anomalously high oscillations of velocity of longitudinal ultrasound in high pure type I superconductor at weak external magnetic field

TL;DR

This paper reports the first experimental observation of strong oscillations in ultrasound velocity in a high purity type I superconductor at low temperatures and weak magnetic fields, revealing new insights into superconducting electron dynamics.

Contribution

It introduces the first experimental detection of large ultrasound velocity oscillations in a high purity type I superconductor under weak magnetic fields at low temperatures.

Findings

Strong ultrasound velocity oscillations observed at 0.4 K

Oscillations depend on magnetic field magnitude and orientation

Results suggest novel electron behavior in superconducting state

Abstract

We have experimentally observed, for the first time, the very strong oscillations of the velocity of the longitudinal ultrasound attenuation in a normal metal state of the high pure type I superconductor at the magnetic field H at the low temperature of 0.4 K. The oscillations appear, following the change of either: the magnitude of the magnetic field H or the orientation of the magnetic field H in the plane: the magnetic field H perpendicular to the wave vector k.