On the role of Ag in improved YBa2Cu3O7-δ flms

Yupu Li, J. R. Liu, X. T. Cui, Y. Cao, Z. J. Qu, Q. Y. Chen, C. W. Chu, W. K. Chu

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

In the present paper, we report that (i) silver could also help in crystallization along the c-direction, as shown in high quality Ag-doped YBa2Cu3O7-δ (YBCO) films prepared by both laser ablation and DC Magnetron sputtering. In the case of the c-oriented films on (100) SrTiO3 and (100) LaAlO3 substrates in the near surface region, from ion channeling analysis, we obtained χmin=1.5% and χmin=3.5%, respectively, better than the undoped films; (ii) some Ag was found to re-evaporate during the film deposition and the percentage of retained Ag was dependent on the deposition techniques (mainly the deposition time and temperature). By RBS and ion channeling analyses we have found that about 1 wt.% Ag remained in the laser ablated Ag-doped film prepared from a 3 wt. % Ag-YBCO target, and (iii) at least some retained Ag occupied substitution positions. Jc (77K) measured by the SQUID magnetometer for the laser ablated Ag-doped film was found to be enhanced by a factor of 2 in comparison with the undoped film. The Jc enhancement in Ag doped films may not totally come from the improvement of the in-plane alignment.

Original languageEnglish
Pages (from-to)653-654
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume282-287
Issue numberPART 2
DOIs
Publication statusPublished - 1997 Aug

All Science Journal Classification (ASJC) codes

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

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