Visualization of the Meissner Effect Using Miniaturized Quantum Magnetometers

초록

Featured Application A novel, non-destructive imaging method for observing the Meissner effect in superconductors is demonstrated in this work, using miniaturized scanning quantum magnetometry based on solid-state defect qubits. This approach enables the direct visualization of magnetic field profiles, offering a practical and accessible way to characterize superconducting properties. The technique is well-suited for applications in science education and as an early-stage diagnostic tool for identifying superconductivity.Abstract The direct visualization of the Meissner effect is achieved by mapping the expulsion of static magnetic fields from a high-TC superconductor, specifically Yttrium Barium Copper Oxide (YBCO). This is accomplished using a miniaturized scanning magnetometer based on an ensemble of nitrogen-vacancy (NV) centers in diamond, operating under ambient room-temperature conditions. By comparing the magnetic field profiles above the YBCO sample at temperatures above and below its critical temperature TC, we observe clear suppression and distortion of the magnetic field in the superconducting state. These observations are consistent with both magnetic simulations and expected characteristics of the Meissner effect. This work introduces a novel and practical method for visualizing the Meissner effect, offering potential applications in educational demonstrations and the diagnostic testing of superconductivity using room-temperature quantum magnetometry.

키워드