YBa$_2$Cu$_3$O$_7$ nano-constriction Josephson junctions and SQUIDs fabricated by focused helium-ion-beam irradiation
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911283868073984 |
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| author | Schmid, Christoph Buckreus, Christopher Haas, David Pröpper, Max Hutt, Robin Magén, César Hanisch, Dominik Karrer, Max Schilling, Meinhard Koelle, Dieter Kleiner, Reinhold Goldobin, Edward |
| author_facet | Schmid, Christoph Buckreus, Christopher Haas, David Pröpper, Max Hutt, Robin Magén, César Hanisch, Dominik Karrer, Max Schilling, Meinhard Koelle, Dieter Kleiner, Reinhold Goldobin, Edward |
| contents | By focused $30\,\mathrm{keV}$ He ion beam irradiation, epitaxially grown YBa$_2$Cu$_3$O$_7$ (YBCO) thin films can be driven from the superconducting to the insulating state with increasing irradiation dose. A properly chosen dose suppresses superconductivity down to $4\,\mathrm{K}$, while crystallinity is still preserved. With this approach we create areas of normal-conducting YBCO that can be used to define resistively shunted constriction-type Josephson junctions (cJJs) on the nanometer scale. We also demonstrate that the fabricated cJJs can be incorporated in direct current superconducting quantum interference devices and can be used as detector junctions in THz antennas. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_19197 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | YBa$_2$Cu$_3$O$_7$ nano-constriction Josephson junctions and SQUIDs fabricated by focused helium-ion-beam irradiation Schmid, Christoph Buckreus, Christopher Haas, David Pröpper, Max Hutt, Robin Magén, César Hanisch, Dominik Karrer, Max Schilling, Meinhard Koelle, Dieter Kleiner, Reinhold Goldobin, Edward Superconductivity Quantum Physics By focused $30\,\mathrm{keV}$ He ion beam irradiation, epitaxially grown YBa$_2$Cu$_3$O$_7$ (YBCO) thin films can be driven from the superconducting to the insulating state with increasing irradiation dose. A properly chosen dose suppresses superconductivity down to $4\,\mathrm{K}$, while crystallinity is still preserved. With this approach we create areas of normal-conducting YBCO that can be used to define resistively shunted constriction-type Josephson junctions (cJJs) on the nanometer scale. We also demonstrate that the fabricated cJJs can be incorporated in direct current superconducting quantum interference devices and can be used as detector junctions in THz antennas. |
| title | YBa$_2$Cu$_3$O$_7$ nano-constriction Josephson junctions and SQUIDs fabricated by focused helium-ion-beam irradiation |
| topic | Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2511.19197 |