Dilute Co-doping effects on critical current properties in PLD-ErBa2Cu3Oy films

S. Horii, Y. Ichino, Y. Yoshida, K. Matsumoto, Masashi Mukaida, A. Ichinose, J. Shimoyama, K. Kishio

Research output: Contribution to journalArticle

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Abstract

We report the effects of dilute Co-doping on superconducting and critical current properties in ErBa2Cu3Oy/SrTiO3 (Er123/STO) thin films fabricated by pulsed laser deposition (PLD). Critical temperatures (Tc) were systematically increased with substrate temperature (Ts), and therefore the substitution levels of Co into the CuO2 planes can be controlled by Ts. On the other hand, the critical current density (Jc) increased with the decrease in Ts at low temperatures below 50 K. The angular dependence of Jc for the films with relatively heavier Co-doping levels showed the c-axis peaks, which is quite contrast to that for the pure Er123 film. This behavior was observed not only at low temperatures but also at high temperatures. These results indicate that the Co-doping induced generation of the c-axis correlated vortex pinning centers in the Er123 matrix and this new type of pinning center is probably due to the existence of inhomogeneous distribution of the Co-doping levels in the films.

Original languageEnglish
Pages (from-to)837-840
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume445-448
Issue number1-2
DOIs
Publication statusPublished - Oct 1 2006

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Critical currents
Pulsed laser deposition
pulsed laser deposition
critical current
Doping (additives)
Temperature
critical temperature
vortices
substitutes
current density
Vortex flow
Substitution reactions
matrices
thin films
Thin films
Substrates
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Dilute Co-doping effects on critical current properties in PLD-ErBa2Cu3Oy films. / Horii, S.; Ichino, Y.; Yoshida, Y.; Matsumoto, K.; Mukaida, Masashi; Ichinose, A.; Shimoyama, J.; Kishio, K.

In: Physica C: Superconductivity and its applications, Vol. 445-448, No. 1-2, 01.10.2006, p. 837-840.

Research output: Contribution to journalArticle

Horii, S, Ichino, Y, Yoshida, Y, Matsumoto, K, Mukaida, M, Ichinose, A, Shimoyama, J & Kishio, K 2006, 'Dilute Co-doping effects on critical current properties in PLD-ErBa2Cu3Oy films', Physica C: Superconductivity and its applications, vol. 445-448, no. 1-2, pp. 837-840. https://doi.org/10.1016/j.physc.2006.05.036
Horii, S. ; Ichino, Y. ; Yoshida, Y. ; Matsumoto, K. ; Mukaida, Masashi ; Ichinose, A. ; Shimoyama, J. ; Kishio, K. / Dilute Co-doping effects on critical current properties in PLD-ErBa2Cu3Oy films. In: Physica C: Superconductivity and its applications. 2006 ; Vol. 445-448, No. 1-2. pp. 837-840.
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AU - Mukaida, Masashi

AU - Ichinose, A.

AU - Shimoyama, J.

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AB - We report the effects of dilute Co-doping on superconducting and critical current properties in ErBa2Cu3Oy/SrTiO3 (Er123/STO) thin films fabricated by pulsed laser deposition (PLD). Critical temperatures (Tc) were systematically increased with substrate temperature (Ts), and therefore the substitution levels of Co into the CuO2 planes can be controlled by Ts. On the other hand, the critical current density (Jc) increased with the decrease in Ts at low temperatures below 50 K. The angular dependence of Jc for the films with relatively heavier Co-doping levels showed the c-axis peaks, which is quite contrast to that for the pure Er123 film. This behavior was observed not only at low temperatures but also at high temperatures. These results indicate that the Co-doping induced generation of the c-axis correlated vortex pinning centers in the Er123 matrix and this new type of pinning center is probably due to the existence of inhomogeneous distribution of the Co-doping levels in the films.

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