Effect of noble metal buffer layers on superconducting YBa2Cu3O7 thin films

Chien, C. L.; Xiao, Gang; Streitz, F. H.; Gavrin, A.; Cieplak, M. Z.
December 1987
Applied Physics Letters;12/21/1987, Vol. 51 Issue 25, p2155
Academic Journal
Superconducting YBa2Cu3O7 thin films have been prepared by using a magnetron sputtering system in the single-source mode. Samples deposited on [100] single-crystal MgO with and without a Au buffer layer all show high transition temperatures (82–87 K). The use of a Au buffer layer significantly improves the superconducting properties, particularly the Meissner effect and critical current density (3.3×106 A/cm2 at T=2 K and 3.5×104 A/cm2 at T=77 K). The Au films remain metallic after high-temperature annealing in an oxygen atmosphere. We propose to use Au buffer layers as current shunts to protect superconducting films and devices.


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