Ultra-large current transport in thick SmBa2Cu3O7-x films grown by reactive co-evaporation
- 주제(키워드) SmBCO coated conductor , Room-temperature thermoelectric microscopy , Low temperature optical scanning microscopy , Micro-Raman scattering spectroscopy , Dissipative current distribution
- 등재 SCIE, SCOPUS
- 발행기관 ELSEVIER SCIENCE BV
- 발행년도 2015
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000115654
- 본문언어 영어
- Published As http://dx.doi.org/10.1016/j.physc.2015.03.019
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Structural and transport properties of high performance SmBa2Cu3O7-x coated conductors produced by a dual-chamber co-evaporation are presented. The 5 mu m-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. (C) 2015 Elsevier B.V. All rights reserved.
more