Study of vortex dynamics in an a-MoGe thin film using low-frequency two-coil mutual inductance measurements

TL;DR

This study uses low-frequency two-coil mutual inductance measurements to analyze vortex lattice parameters in a superconducting a-MoGe thin film, revealing field-dependent behaviors consistent with a weakly pinned 2D vortex lattice.

Contribution

It introduces a method to extract vortex lattice parameters from mutual inductance measurements in thin superconducting films.

Findings

Parameters follow expected magnetic field variation for weakly pinned 2D vortex lattice.

Demonstrates a procedure for extracting pinning and vortex dynamics parameters.

Validates the use of Coffey-Clem model in thin film vortex analysis.

Abstract

We extract the vortex lattice parameters using low-frequency two-coil mutual inductance measurements in a 20-nm-thick superconducting a-MoGe thin film. We fit the temperature dependence of ac penetration depth in the mixed state using a model developed by Coffey and Clem and demonstrate a procedure for extracting vortex lattice parameters such as pinning constant, vortex lattice drag coefficient, and pinning potential barrier. We show that the extracted parameters follow the magnetic field variation expected for a weakly pinned 2-dimensional vortex lattice.