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Related Experiment Video

Updated: May 8, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

A new methodology for studying vortex dynamics based on point-contact spectroscopy.

Xiaomei Hu¹, Fan Zhang², Xingyuan Hou^1,3,4

¹Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China.

The Review of Scientific Instruments

|December 11, 2023

Summary

Researchers developed a new method using soft point contacts to observe vortex dynamics in superconductors. This technique offers high sensitivity for detecting vortex motion and jumps, advancing the study of type-II superconductors.

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Area of Science:

Condensed Matter Physics
Superconductivity Research

Background:

Vortex dynamics in type-II superconductors are crucial for fundamental physics and applications.
Existing methods for detecting local vortex motion or jumps lack high sensitivity.

Purpose of the Study:

To develop a novel, high-sensitivity method for detecting local vortex dynamics in superconductors.
To investigate vortex motion using point contact Andreev reflection spectroscopy.

Main Methods:

Fabrication of soft point contacts on 2H-NbSe2 superconductor.
Utilizing scanning electron microscopy to characterize micro-constrictions.
Performing Andreev reflection spectroscopy and analyzing differential conductance variations over time.

Main Results:

Differential conductance spontaneously varied over time in perpendicular magnetic fields.
Variations were linked to vortex motion across micro-constrictions.
Conductance changes disappeared at zero/large fields or parallel fields.

Conclusions:

Point contact Andreev reflection spectroscopy is a promising technique for studying vortex dynamics.
This method offers high time resolution for observing vortex motion in superconductors.
The findings advance the understanding of vortex behavior in type-II superconductors.