Peak effect in NdBa2Cu3O7-δ superconductor and related Raman spectra

L. V. Hong, D. C. Hiep, N. X. Phuc, Masato Kakihana, J. Ding

Research output: Contribution to journalConference articlepeer-review

Abstract

A peak effect of the critical current density was observed for all NdBa2Cu3O7-δ (Nd123) samples prepared by the solid-state reaction method in atmospheres containing different oxygen concentrations. The peak position (field value) and its critical current density value measured at 30, 50, and 71 K depend strongly on the sintering time, and on the oxygen concentration in the sintering atmosphere. The synthesized samples have a high critical temperature Tc of about 96 K and a ΔTc[ = T(0.9 ρonset) - T(0.1 ρonset), ρonset is the normal-state resistivity] lower than 2 K. It implies that the samples are of single superconducting phase without oxygen deficiency. Macro-Raman and micro-Raman spectra were recorded at room temperature for all samples. New modes, supposed to be related with disorder in chain layers, were observed. The disorder is assumed to be induced by a substitution of magnetic Nd3+ ions into the Ba2+ sites in the Nd123 lattice, and is considered to be a main cause of the obtained peak effect.

Original languageEnglish
Pages (from-to)520-525
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume262
Issue number3
DOIs
Publication statusPublished - 2003 Jun 1
Externally publishedYes
EventHanoi International Symposium - Hanoi, Viet Nam
Duration: 2002 Sep 302002 Sep 30

Keywords

  • High T superconductor
  • Raman scattering
  • Secondary peak effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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