Current limiting phenomena in SmBa2Cu3O7 coated conductors observed by laser-induced thermoelectric imaging and low-temperature laser scanning microscopy

G. Kim, W. Jo, A. Matsekh, M. Inoue, T. Kiss, H. S. Ha, S. S. Oh

研究成果: ジャーナルへの寄稿学術誌査読

4 被引用数 (Scopus)

抄録

SmBa2Cu3O7 (SmBCO) coated conductors were grown on IBAD-MgO templates the evaporation using a drum-in-dual-chambers (EDDC) deposition system. The material showed a critical temperature of 93 ̃ 94 K and a critical current of 200 ̃ 250 A/cm-width at 77 K in a self-field. The current-limiting properties and local structure of the films were examined by laser-induced thermoelectric (LITE) imaging and lowtemperature laser scanning microscopy (LTLSM). Surface morphology and chemical composition of the superconducting layers were examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. A 100μm × 1mm-microbridgewas fabricated using a photolithographic technique and etching process. The measured LITE images of the SmBCO coated conductor showed that some grains on the surface, surface inhomogeneity, second phases, defects and tilted grains, cause different thermal gradients. The LTLSM images revealed twodimensional variations of local flux flow on the films as a function of the local critical current. The findings are consistent with the LITE images, indicating that both methods can visualize the local structures and phases.

本文言語英語
論文番号5635355
ページ(範囲)3421-3424
ページ数4
ジャーナルIEEE Transactions on Applied Superconductivity
21
3 PART 3
DOI
出版ステータス出版済み - 6月 2011

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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