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http://dx.doi.org/10.9714/psac.2020.22.2.021

Enhanced flux pinning property of GdBa2Cu3O7-x films by ferromagnetic surface decoration  

Song, C.Y. (Department of Physics, Chungbuk National University)
Oh, J.Y. (Department of Physics, Chungbuk National University)
Ko, Y.J. (Department of Physics, Chungbuk National University)
Lee, J.M. (Department of Physics, Sungkyunkwan University)
Kang, W.N. (Department of Physics, Sungkyunkwan University)
Kang, B. (Department of Physics, Chungbuk National University)
Publication Information
Progress in Superconductivity and Cryogenics / v.22, no.2, 2020 , pp. 21-25 More about this Journal
Abstract
We investigated the flux pinning property of GdBa2Cu3O7-x (GdBCO) films on top of La0.7Sr0.3MnO3 (LSMO) nanoparticles deposited by a surface decoration. Both GdBCO films and LSMO nano particles were deposited by pulsed laser deposition and the number of laser pulses were varied from 80 to 320 in order to control the density of the LSMO nanoparticles. The magnetization data at 77 K showed that the critical current density (Jc) was enhanced in all of the GdBCO films with LSMO nanoparticles and that the Jc enhancement was found to be inversely proportional to the LSMO nanoparticle density. Structural analyses revealed that LSMO nanoparticles induce a compressive strain in the GdBCO films resulting in a disordering in the CuO2 plane. Therefore, the enhanced flux pinning property in the GdBCO with LSMO nanoparticles was attributed to the competing effect between the increase of pinning centers and the increase of compressive strain in the superconducting phase.
Keywords
GdBCO; LSMO; surface decoration; flux pinning;
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