Measurement of Magnetic Relaxation in the peak regime of V3Si

TL;DR

This study investigates magnetic relaxation in V3Si superconductors, revealing logarithmic flux creep behavior and athermal flux avalanches influenced by external perturbations during measurements.

Contribution

It provides new insights into the relaxation dynamics in the peak effect regime of V3Si, highlighting the role of flux avalanches and external perturbations.

Findings

Relaxation in increasing field is logarithmic, consistent with flux creep theory.

Decreasing field relaxation shows athermal behavior dominated by flux avalanches.

External field perturbations trigger flux avalanches affecting relaxation dynamics.

Abstract

Magnetization relaxation measurements are carried out in the Peak effect regime of superconducting V3Si crystal, using Quantum Design SQUID magnetometer. Relaxation in the increasing field scan is logarithmic in time, consistent with the theory of flux creep. The relaxation on the decreasing field scan however exhibits athermal behavior which is predominantly governed by the flux avalanches triggered by the small external field perturbation experienced by the superconductor during measurement scan in an inhomogeneous field.