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Materials 2018, 11(2), 211; https://doi.org/10.3390/ma11020211

Vortex Lattice Instabilities in YBa2Cu3O7-x Nanowires

1
Dipartimento di Fisica, Universitá degli Studi di Napoli Federico II, 80126 Napoli, Italy
2
Dipartimento di Ingegneria Elettrica e delle Tecnologie dell’Informazione, Università degli Studi di Napoli Federico II, 80125 Napoli, Italy
3
CNR-SPIN UOS Napoli, Monte Sant’Angelo, 80126 Napoli, Italy
4
Institut de Ciència de Materials de Barcelona, CSIC, Campus de la UAB, 08193 Bellaterra, Spain
*
Author to whom correspondence should be addressed.
Received: 5 January 2018 / Revised: 23 January 2018 / Accepted: 24 January 2018 / Published: 30 January 2018
(This article belongs to the Special Issue Advances in Superconductive and Magnetic Nanomaterials)
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Abstract

High-resolution focused ion beam lithography has been used to fabricate YBa2Cu3O7-x (YBCO) wires with nanometric lateral dimensions. In the present work, we investigate Flux-flow instabilities in nanowires of different widths, showing sudden voltage switching jumps from the superconducting to the normal state. We present an extensive study on the temperature and field dependence of the switching characteristics which reveal that voltage jumps become less abrupt as the temperature increases, and disappear at the vortex-liquid state. On the contrary, the current distribution at the critical point becomes narrower at high temperatures. Sharp voltage switchings very close to the critical current density can be obtained by reducing the width of the nanowires, making them very appealing for practical applications. View Full-Text
Keywords: high-temperature superconducting nanowires; flux-flow instabilities; critical vortex velocity; switching voltage jumps; single-photon detectors high-temperature superconducting nanowires; flux-flow instabilities; critical vortex velocity; switching voltage jumps; single-photon detectors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Rouco, V.; Massarotti, D.; Stornaiuolo, D.; Papari, G.P.; Obradors, X.; Puig, T.; Tafuri, F.; Palau, A. Vortex Lattice Instabilities in YBa2Cu3O7-x Nanowires. Materials 2018, 11, 211.

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