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Improved Nanopatterning for YBCO Nanowires Approaching the Depairing Current

Riccardo Arpaia (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Shahid Nawaz (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Floriana Lombardi (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Thilo Bauch (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Ieee Transactions on Applied Superconductivity (1051-8223). Vol. 23 (2013), 3,
[Artikel, refereegranskad vetenskaplig]

An improved nanopatterning procedure has been developed to obtain YBa2Cu3O7-x nanowires with cross-sections as small as 50 x 50 nm(2), protected by an Au capping layer. To probe the effective role of the Au protecting layer, we have measured the current-voltage characteristics and the resistive transition in temperature of the nanowires. Critical current densities up to 108 A/cm(2) have been achieved at T = 4.2 K, approaching the theoretical depairing current limit. The resistance, measured as a function of temperature close to T-c, has been fitted with a thermal activated phase slip model, including the effect of the gold layer. The extracted values of the superconducting coherence length and of the London penetration depth give current densities consistent with the measured ones. These results cannot be achieved with nanowires without the Au capping layer.

Nyckelord: High-temperature superconductors, nanofabrication, phase slips, superconducting nanostructures

Denna post skapades 2013-07-01. Senast ändrad 2016-09-14.
CPL Pubid: 179542


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Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik



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