Production and identification of flux-pinning defects by electron irradiation in YBa2Cu3O7-x single crystals
- Authors
- GIAPINTZAKIS, J; LEE, WC; RICE, JP; GINSBERG, DM; ROBERTSON, IM; WHEELER, R; KIRK, MA; RUAULT, MO
- Issue Date
- May-1992
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.45, no.18, pp 10677 - 10683
- Pages
- 7
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 45
- Number
- 18
- Start Page
- 10677
- End Page
- 10683
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151115
- DOI
- 10.1103/PhysRevB.45.10677
- ISSN
- 0163-1829
- Abstract
- An enhancement in J(c) of YBa2Cu3O7-x single crystals in a magnetic field is observed after irradiation with 1-MeV electrons. Typically, a factor-of-2 increase in J(c) is deduced from magnetic hysteresis loops at 10 K and 1 T with H parallel-to c. This enhancement is about 1/2 of that produced by proton and neutron irradiations under similar measurement conditions. In situ transmission-electron-microscopy studies found no visible defects induced by electron irradiation, which means that point defects or small clusters (of size < 2 nm) are responsible for the extra pinning. Annealing studies suggest that effective pinning centers for H parallel-to c do not include oxygen vacancies in the Cu-O chains. Based on calculations of cross sections for displacements on the different sublattices, and in conjunction with the results of a J(c) calculation by Kes, we suggest that the most likely pinning defect is the displacement of a Cu atom from the CuO2-plane sites.
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