We describe the controlled use of a 17 keV X-ray synchrotron nano-beam to progressively change the oxygen doping level in Bi-2212 superconducting whisker-like single crystals. Our data combine structural and electrical information collected on the same crystals, showing a maximum change in the critical temperature Tc of 1.3 K and a maximum elongation of about 1 Å in the c-axis length, compared to the as-grown conditions. Simulations of our experimental conditions by means of a finite element model exclude local heating induced by the X-ray nano-beam as a possible cause for the change in the doping level and suggest an important role of secondary electrons. These findings support the possible use of hard X-rays as a novel direct-writing, photoresist-free lithographic process for the fabrication of superconducting devices, with potential nanometric resolution and 3D capability.

Doping change in the Bi-2212 superconductor directly induced by a hard X-ray nano-beam

PAGLIERO, ALESSANDRO;MINO, LORENZO;BORFECCHIA, ELISA;TRUCCATO, Marco;AGOSTINO, Angelo;PASCALE, LISE;LAMBERTI, Carlo;
2014

Abstract

We describe the controlled use of a 17 keV X-ray synchrotron nano-beam to progressively change the oxygen doping level in Bi-2212 superconducting whisker-like single crystals. Our data combine structural and electrical information collected on the same crystals, showing a maximum change in the critical temperature Tc of 1.3 K and a maximum elongation of about 1 Å in the c-axis length, compared to the as-grown conditions. Simulations of our experimental conditions by means of a finite element model exclude local heating induced by the X-ray nano-beam as a possible cause for the change in the doping level and suggest an important role of secondary electrons. These findings support the possible use of hard X-rays as a novel direct-writing, photoresist-free lithographic process for the fabrication of superconducting devices, with potential nanometric resolution and 3D capability.
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http://pubs.acs.org/doi/abs/10.1021/nl404834u
High-Temperature Superconductors (HTSC); Bi-2212; single crystal; whiskers; doping; nanolithography; X-rays nano-beam; synchrotron radiation
Alessandro Pagliero; Lorenzo Mino; Elisa Borfecchia; Marco Truccato; Angelo Agostino; Lise Pascale ;Emanuele Enrico; Natascia De Leo; Carlo Lamberti; Gema Martinez-Criado
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/148323
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