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Autores principales:	Chen, C., Liu, Y., Chen, Y., Hu, Y. N., Zhang, T. Z., Li, D., Wang, X., Wang, C. X., Lu, Z. Y. W., Zhang, Y. H., Zhang, Q. L., Dong, X. L., Wang, R., Feng, D. L., Zhang, T.
Formato:	Preprint
Publicado:	2024
Materias:	Superconductivity Materials Science Applied Physics
Acceso en línea:	https://arxiv.org/abs/2403.17671
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

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author	Chen, C. Liu, Y. Chen, Y. Hu, Y. N. Zhang, T. Z. Li, D. Wang, X. Wang, C. X. Lu, Z. Y. W. Zhang, Y. H. Zhang, Q. L. Dong, X. L. Wang, R. Feng, D. L. Zhang, T.
author_facet	Chen, C. Liu, Y. Chen, Y. Hu, Y. N. Zhang, T. Z. Li, D. Wang, X. Wang, C. X. Lu, Z. Y. W. Zhang, Y. H. Zhang, Q. L. Dong, X. L. Wang, R. Feng, D. L. Zhang, T.
contents	Vortex pinning is a crucial factor that determines the critical current of practical superconductors and enables their diverse applications. However, the underlying mechanism of vortex pinning has long been elusive, lacking a clear microscopic explanation. Here using high-resolution scanning tunneling microscopy, we studied single vortex pinning induced by point defect in layered FeSe-based superconductors. We found the defect-vortex interaction drives low-energy vortex bound states away from EF, creating a "mini" gap that effectively lowers the system energy and enhances pinning. By measuring the local density-of-states, we directly obtained the elementary pinning energy and estimated the pinning force via the spatial gradient of pinning energy. The results are consistent with bulk critical current measurement. Furthermore, we show that a general microscopic quantum model incorporating defect-vortex interaction can naturally capture our observation. It suggests that the local pairing near pinned vortex core is actually enhanced compared to unpinned vortex, which is beyond the traditional understanding that non-superconducting regions pin vortices. Our study thus unveils a general microscopic mechanism of vortex pinning in superconductors, and provides insights for enhancing the critical current of practical superconductors.
format	Preprint
id	arxiv_https___arxiv_org_abs_2403_17671
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Revealing the Microscopic Mechanism of Elementary Vortex Pinning in Superconductors Chen, C. Liu, Y. Chen, Y. Hu, Y. N. Zhang, T. Z. Li, D. Wang, X. Wang, C. X. Lu, Z. Y. W. Zhang, Y. H. Zhang, Q. L. Dong, X. L. Wang, R. Feng, D. L. Zhang, T. Superconductivity Materials Science Applied Physics Vortex pinning is a crucial factor that determines the critical current of practical superconductors and enables their diverse applications. However, the underlying mechanism of vortex pinning has long been elusive, lacking a clear microscopic explanation. Here using high-resolution scanning tunneling microscopy, we studied single vortex pinning induced by point defect in layered FeSe-based superconductors. We found the defect-vortex interaction drives low-energy vortex bound states away from EF, creating a "mini" gap that effectively lowers the system energy and enhances pinning. By measuring the local density-of-states, we directly obtained the elementary pinning energy and estimated the pinning force via the spatial gradient of pinning energy. The results are consistent with bulk critical current measurement. Furthermore, we show that a general microscopic quantum model incorporating defect-vortex interaction can naturally capture our observation. It suggests that the local pairing near pinned vortex core is actually enhanced compared to unpinned vortex, which is beyond the traditional understanding that non-superconducting regions pin vortices. Our study thus unveils a general microscopic mechanism of vortex pinning in superconductors, and provides insights for enhancing the critical current of practical superconductors.
title	Revealing the Microscopic Mechanism of Elementary Vortex Pinning in Superconductors
topic	Superconductivity Materials Science Applied Physics
url	https://arxiv.org/abs/2403.17671

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