Addition of nanoparticle dispersions to enhance flux pinning of the YBa2Cu3O7-x superconductor

Abstract

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Tuning nanoparticle size for enhanced functionality in perovskite thin films deposited by metal organic deposition

“…After the seminal works demonstrated that second-phase additions 4,12 to RE-Ba-Cu-O (rare earth (RE)) (REBCO) thin films grown using pulsed laser deposition (PLD) significantly improved the current carrying performance in an applied magnetic field, 3,[13][14][15] it was shown that the morphology of the inclusions depends on the synthesis 1 Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM, USA; 2 Graduate School of Science and Technology, Seikei University, Tokyo, Japan; 3 Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, Japan; 4 National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan; method (that is, in situ vs ex situ). 3,16 Moreover, recent work has shown that large quantities (⩾10%) of second-phase additions are required to obtain the desired level of performance in superconductors.…”

Theory and simulations on strong pinning of vortex lines by nanoparticles

“…While in the first superconducting cables the critical currents were limited by weak links, in the second generation superconducting wires based on aligned YBa 2 Cu 3 O 7 (YBCO) films this problem was mostly resolved and critical currents are determined by vortex pinning. An impressive progress has been made to enhance critical currents in these films using both isotropic [1][2][3][4][5][6][7] and columnar [8][9][10] inclusions. In spite of this progress, understanding of strong pinning mechanisms is far from satisfactory.…”

Bulk nanocrystalline superconducting YBa2Cu3O7-x

“…This is attributed to weak transmission across d-wave grain boundaries at large misorientation angles [1][2][3][4][5]. Several techniques have been investigated to increase J C , including increasing the flux pinning through nano-particle additions [6] and improving the superconducting properties of the grain boundary [7][8][9]. Unfortunately pinning effects that come from the nanoscale disorder in the materials are drastically weakened by a large anisotropy in YBCO [10], and it is not clear that pinning within the grains will increase the macroscopic J C .…”