Strong irradiation-induced vortex pinning in (Cu,C)Ba<sub>2</sub>Ca<sub>3</sub>Cu<sub>4</sub>O<sub>11+</sub><sub>d</sub>
ORAL
Abstract
We report on the strong enhancement of vortex pinning in the 115K-superconductor (Cu,C)Ba2Ca3Cu4O11+d following irradiation with 6 MeV protons. While Tc decreases by only ~2K after doses of up to 1017 p/cm2, the critical current density Jc is enhanced by a factor of 40 in fields above 2 Tesla and at temperatures above 60 K, matching well the range of intended applications. We estimate Jc from magnetization hysteresis measurements on polycrystalline samples using the Bean model. The whole-sample Jc values, deduced by using the sample size as dimension in Bean’s model, approach 5000 A/cm2 at 77 K and 1 T. These values are comparable to those of grain-aligned YBa2Cu3Ox intended for trapped-field magnets, underlining the application potential of this material if produced for instance in film form. The evolution of the field dependence of Jc with irradiation dose is consistent with a model of strong pinning by large-size inclusions.
*Materials characterization at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Materials Sciences and Engineering Division. Sample synthesis at Nanjing University was supported by National Key R&D Program of China and National Natural Science Foundation of China.
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Presenters
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Wai-Kwong Kwok
- Argonne National Laboratory
- Material Sciences, Argonne National Laboratory
- Argonne Natl Lab
- Materials Science Division, Argonne National Laboratory
- Materials Science Division, Argonne Natl Lab
- Argonne National Lab