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

Title
Current limiting phenomena in SmBa2Cu3O7 coated conductors observed by laser-induced thermoelectric imaging and low-temperature laser scanning microscopy
Authors
Kim G.Jo W.Matsekh A.Inoue M.Kiss T.Ha H.-S.Oh S.S.
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2011
Journal Title
IEEE Transactions on Applied Superconductivity
ISSN
1051-8223JCR Link
Citation
vol. 21, no. 3 PART 3, pp. 3421 - 3424
Indexed
SCI; SCIE; SCOPUS WOS 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. © 2010 IEEE.
DOI
10.1109/TASC.2010.2086040
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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