Affordable Access

Publisher Website

The effect of rare-earth substitution at the Ba site on the flux pinning properties of Y(Ba2− xRx)Cu3O7− δ(for R=La, Pr, and Nd)

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
391
Issue
1
Identifiers
DOI: 10.1016/s0921-4534(03)00810-4
Keywords
  • Yba2Cu3O7−δ
  • Rare-Earth Substitution
  • Ba Site
  • Critical Current Density
  • Flux Pinning
  • Magnetization
Disciplines
  • Physics

Abstract

Abstract The behavior of the critical current density ( J c) and critical temperature ( T c) with rare-earth substitution at the Ba site in Y(Ba 2− x R x )Cu 3O 7− δ (0⩽ x⩽0.15) (for R=La, Pr, and Nd) has been investigated. In the case of magnetic rare-earth substitutions (Pr and Nd), a specific secondary peak appears and grows in the J c– H curves with increasing x, whereas no such peak emerges in a case of nonmagnetic rare-earth (La) substitution. This result suggests that the magnetic moment at the Ba site is an important factor generating defects that act as effective “field-induced type” pinning centers. However, the magnetic moment does not directly affect the variation in T c. That is, while the T c of Pr-substituted samples decreases monotonically with increasing x, the T c of Nd-substituted samples exhibits a maximum at low x (∼0.05), as is the case for La-substituted samples. Accordingly, Nd substitution is considered to be the most effective way of enhancing J c, because of its ability to generate defects that can act as effective pinning centers without inducing any noticeable suppression of superconductivity in the matrix.

There are no comments yet on this publication. Be the first to share your thoughts.