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

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish
Article number5635355
Pages (from-to)3421-3424
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume21
Issue number3 PART 3
DOIs
StatePublished - Jun 2011

Bibliographical note

Funding Information:
Manuscript received August 03, 2010; accepted October 04, 2010. Date of publication November 15, 2010; date of current version May 27, 2011. This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korean government (MEST) (R01-2008-000-21080-0) and a grant from the Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea. This work was supported by the “Japan-East Asia Network of Exchange for Students and Youths (JENESYS) Programme Scholarship” and “JSPS: KAKENHI (20360143)”.

Keywords

  • Current limiting properties
  • HTS
  • LITE images
  • LTLSM
  • SmBCO thin films

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