Ultra-large current transport in thick SmBa2Cu3O7-x films grown by reactive co-evaporation

G. Kim, H. J. Jin, W. Jo, D. H. Nam, H. Cheong, H. S. Kim, S. S. Oh, R. K. Ko, Y. S. Jo, D. W. Ha

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Structural and transport properties of high performance SmBa2Cu3O7-x coated conductors produced by a dual-chamber co-evaporation are presented. The 5 μm-thick SmBCO coated conductors grown on IBAD-MgO based Hastelloy metal templates show critical currents larger than 1020-1560 A/cm at 77 K and self-field. The current transport characteristics of the conductors are investigated by room-temperature thermoelectric microscopy and low-temperature bolometric microscopy. The local thermoelectric images show the tilted grains, grain boundaries, and microstructural defects on the surface of the coated conductors. The bias current-dependent bolometric response at low temperature displays the current of the local flux flow dissipation as an increasing bias. Furthermore, we measured micro-Raman scattering microscopic imaging on oxygen-related peaks of the conductors. Comparing the Raman signal images with the low temperature optical scanning maps, it is remarkable that the structural disorders represented by oxygen-related Raman peaks are closely related to the low temperature bolometric abnormalities. From this result, a nature of the dissipative current distribution in coated conductors is revealed. The scanning optical microscopic study will provide a promising method for quality assurance of coated conductors.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume513
DOIs
StatePublished - 15 Jun 2015

Keywords

  • Dissipative current distribution
  • Low temperature
  • Micro-Raman scattering spectroscopy
  • optical scanning microscopy
  • Room-temperature thermoelectric microscopy
  • SmBCO coated conductor

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