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, Masayoshi Inoue, Takanobu Kiss, H. S. Ha, S. S. Oh

Research output: Contribution to journalArticle

4 Citations (Scopus)

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
Publication statusPublished - Jun 1 2011

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Microscopic examination
conductors
microscopy
Scanning
Imaging techniques
scanning
Lasers
Critical currents
lasers
critical current
Temperature
Ion beam assisted deposition
drums
Thermal gradients
Surface morphology
Energy dispersive spectroscopy
Etching
critical temperature
chemical composition
Evaporation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Current limiting phenomena in SmBa2Cu3O7 coated conductors observed by laser-induced thermoelectric imaging and low-temperature laser scanning microscopy. / Kim, G.; Jo, W.; Matsekh, A.; Inoue, Masayoshi; Kiss, Takanobu; Ha, H. S.; Oh, S. S.

In: IEEE Transactions on Applied Superconductivity, Vol. 21, No. 3 PART 3, 5635355, 01.06.2011, p. 3421-3424.

Research output: Contribution to journalArticle

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