Influence of random point defects introduced by proton irradiation on the flux creep rates and magnetic field dependence of the critical current density Jc of co-evaporated GdBa2Cu3O7−δ coated conductors. (28th October 2015)

• Record Type: Journal Article
• Authors: Haberkorn, N; Kim, Jeehoon; Suárez, S; Lee, Jae-Hun; Moon, S H
• Is Part Of: Superconductor science & technology. Volume 28:Number 12(2015:Dec.)
• Publication Date: 2015-10-28
• Subjects: coated conductors -- vortex dynamics -- proton irradiation; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/28/12/125007
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We report the influence of random point defects introduced by 3 MeV proton irradiation (doses of 0.5 × 10 16, 1 × 10 16, 2 × 10 16 and 6 × 10 16 cm −2 ) on the vortex dynamics of co-evaporated 1.3 μ m thick, GdBa2 Cu3 O7− δ coated conductors. Our results indicate that the inclusion of additional random point defects reduces the low field and enhances the in-field critical current densities J c . The main in-field J c enhancement takes place below 40 K, which is in agreement with the expectations for pinning by random point defects. In addition, our data show a slight though clear increase in flux creep rates as a function of irradiation fluence. Maley analysis indicates that this increment can be associated with a reduction in the exponent μ characterizing the glassy behavior.