Low magnetic relaxation in a single crystal and a melt processed NdBa2Cu3O7-δ sample

A. J.J. Van Dalen, M. R. Koblischka, H. Kojo, K. Sawada, T. Higuchi, M. Murakami

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Induced current densities js and magnetic relaxation rates S ≡ -d In js/d In t were measured over a wide temperature (5 ≤ T ≤ 90 K) and field range (0 ≤ μ0Ha ≤ 7 T) on a single crystal and a melt processed sample of NdBa2Cu3O7-δ using a SQUID magnetometer. The temperature dependence of the magnetic relaxation rate shows a pronounced minimum at elevated temperatures. This leads to very high values of the effective pinning energy U0(77 K) = 4500 K and U0(77 K) = 2900 K for the single crystal and the melt processed sample respectively, for an applied magnetic field μ0Ha = 1.0 T. Furthermore, these samples show a well developed fishtail effect, leading to a current density js(77 K, μ0Ha = 2 T) = 3 x 104 A m-2. This demonstrates that the fishtail effect is closely related to the low relaxation rates observed here.

Original languageEnglish
Pages (from-to)659-664
Number of pages6
JournalSuperconductor Science and Technology
Volume9
Issue number8
DOIs
Publication statusPublished - 1996 Aug 1

ASJC Scopus subject areas

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

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