Microstructure and JQ characteristics of Er123 films with artificial pinning centers

Masashi Mukaida, Tomoya Horide, Yuki Shingai, Ataru Ichinose, Kaname Matsumoto, Shigeru Horii, Ryusuke Kita, Yutaka Yoshida, Satoshi Awaji, Kazuo Watanabe, Ryo Teranishi, Kazuhiro Yamada, Nobuyuki Mori

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Critical current density and surface resistance are evaluated for dilute Zn substituted high quality ErBa2Cu3O7-δ films. Dilute Zn substituted ErBa2Cu3O7-δ films are grown on SrTiO3 substrates by a pulsed laser deposition technique. Targets used in the experiments are un-substituted, 0.3at. %, 0.5at.%, 1.0at.% and 10at.% Zn substituted ErBa2Cu3O 7-δ ceramics. Crystal structures, field angular dependence of critical current density and surface resistance are evaluated. Zn substituting into YBa2Cu3O7-δ has been studied for understanding the origin of oxide superconductivity with substituting level of several %. In this study, dilute Zn below 1.0 at.% is mainly adopted. Further substitution reduces its critical temperature. We intended to introduce zero-dimensional superconductivity killer atoms into CuO2 plane as artificial pinning centers. The obtained Zn substituted ErBa2Cu 3O7-δ films are c-axis oriented without peaks from other phases. The sharp drop temperature of surface resistance decreases as the Zn substitution. However, the surface resistance at a low temperature around 20K is almost the same among the ErBa2Cu3O 7-δ films with different Zn substitution. We also measured the field angular dependence of critical current density of the Zn substituted ErBa2Cu3O7-δ films. There are no strong angular dependences. Dilute zinc substitution increases critical current density for almost of all directions. However, in a high magnetic field of several tesla, pinning force around the field direction of a-axis is enhanced. Double introduction of one dimensional artificial pinning centers such as BaZrO 3 nano-rods and zero dimensional artificial pinning centers is thought to be very effective for increasing critical current density for power cable applications.

Original languageEnglish
Pages (from-to)3688-3691
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
Publication statusPublished - 2007 Jun


  • ErBaCuO Zn J R artificial pinning center


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