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arXiv · 2304.01024

Wide-field quantitative magnetic imaging of superconducting vortices using perfectly aligned quantum sensors

Shunsuke Nishimura·Taku Kobayashi·Daichi Sasaki·Takeyuki Tsuji·Takayuki Iwasaki·Mutsuko Hatano·Kento Sasaki·Kensuke Kobayashi
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Abstract

Various techniques have been applied to visualize superconducting vortices, providing clues to their electromagnetic response. Here, we present a wide-field, quantitative imaging of the stray field of the vortices in a superconducting thin film using perfectly aligned diamond quantum sensors. Our analysis, which mitigates the influence of the sensor inhomogeneities, visualizes the magnetic flux of single vortices in YBa$_2$Cu$_3$O$_{7-\delta}$ with an accuracy of $\pm10~\%$. The obtained vortex shape is consistent with the theoretical model, and penetration depth and its temperature dependence agree with previous studies, proving our technique's accuracy and broad applicability. This wide-field imaging, which in principle works even under extreme conditions, allows the characterization of various superconductors.

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Shunsuke Nishimura, Taku Kobayashi, Daichi Sasaki, Takeyuki Tsuji, Takayuki Iwasaki, Mutsuko Hatano, Kento Sasaki, Kensuke Kobayashi. 2023-04-03. Wide-field quantitative magnetic imaging of superconducting vortices using perfectly aligned quantum sensors. https://doi.org/10.1063/5.0169521

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