The effects of growth temperature on c-axis-correlated pinning centers in PLD-ErBa2Cu3O7-δ films with Ba(Er 0.5Nb0.5)O3

H. Kai, S. Horii, A. Ichinose, R. Kita, K. Matsumoto, Y. Yoshida, T. Fujiyoshi, R. Teranishi, N. Mori, M. Mukaida

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Abstract

Effects of growth temperatures in epitaxial ErBa2Cu 3O7-δ films with one-dimensional nanorods were discussed from their microstructures and superconducting properties. c-axis-oriented BaNb2O6-doped ErBa2Cu 3O7-δ films were grown on (100)-oriented SrTiO 3 substrates grown at 710 and 760 °C by pulsed-laser deposition. Atomic force microscopy analysis showed that film surface steps on the three-dimensional islands increased with decreasing growth temperature (T S). Then, nanorod morphologies were also changed by TS. Ba(Er0.5Nb0.5)O3 nanorods were observed clearly in transmission electron microscopy images of the films. The nanorods were thinner and denser at a lower TS under a nominal BaNb 2O6 (BNO) doping concentration. In the case of T S = 710 °C, the diameter and number density of nanorods with 1.5wt%BNO doping were 4-6nm and 2.6 × 1011cm-2, respectively. Furthermore, the nanorods could effectively act as c-axis-correlated pinning centers in the film grown at a lower TS. Consequently, the pinning effects were controlled by nanorod morphologies through varying the TS.

Original languageEnglish
Article number025017
JournalSuperconductor Science and Technology
Volume23
Issue number2
DOIs
Publication statusPublished - Jan 29 2010

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All Science Journal Classification (ASJC) codes

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

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