Laser drilling: Enhancing superconducting joint of GdBa2Cu 3O7-δ coated conductors

Y. J. Park, M. W. Lee, Y. K. Oh, Haigun Lee

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

While GdBa2Cu3O7-δ (GdBCO) coated conductors (CCs) have been proposed for superconducting applications, they have not been used in devices with persistent current mode (PCM) operation because of a lack of joining techniques. A superconducting joint of CCs, formed via melting diffusion and oxygenation annealing, offers no electrical resistance between the CCs, thus establishing a superconducting closed loop for PCM operation. Because superconductivity degrades with oxygen out-diffusion during melting diffusion, oxygenation annealing allows oxygen diffusion into the GdBCO lattices. As effective oxygenation annealing requires oxygen pathways in the joint, low solubility and diffusivity of oxygen in the buffer and CC substrate hinder full superconductivity recovery. Here we show a laser-drilling technique to produce microholes as conduits on the surfaces of GdBCO CCs' to promote oxygen in-diffusion, which resulted in reduced superconductivity recovery time. Superconductivity was fully recovered after laser drilling, melting diffusion at 850 °C for 1 min, and oxygenation annealing at 500 °C for 350 h.

Original languageEnglish
Article number085008
JournalSuperconductor Science and Technology
Volume27
Issue number8
DOIs
Publication statusPublished - 2014 Aug 1

Fingerprint

laser drilling
Drilling
conductors
oxygenation
Oxygenation
Superconductivity
Lasers
superconductivity
Oxygen
oxygen
Annealing
annealing
melting
Melting
recovery
Recovery
Acoustic impedance
electrical resistance
diffusivity
Joining

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys

Cite this

Laser drilling : Enhancing superconducting joint of GdBa2Cu 3O7-δ coated conductors. / Park, Y. J.; Lee, M. W.; Oh, Y. K.; Lee, Haigun.

In: Superconductor Science and Technology, Vol. 27, No. 8, 085008, 01.08.2014.

Research output: Contribution to journalArticle

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