Harmonic susceptibilities of polycrystalline (La1-xCax)(Ba1.75-xLa0.25+x)Cu3 O7+d synthesized by amorphous metal-complex method

A. Yamaguchi, H. Yasuoka, Y. Tanaka, T. Katsumata, Y. Sato, V. Petrykin, M. Osada, M. Kakihana

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3 Citations (Scopus)

Abstract

Single-phase tetragonal (La1-xCax)(Ba1.75-xLa0.25+x)Cu3 O7+d polycrystals with the composition range 0.1≤x≤1.0 were synthesized by the amorphous metal-complex method. The fundamental and the higher-harmonic complex susceptibilities χn = χn-iχn″ (n = 1, 2, 3, 5, and 7) were measured by means of Hartshorn bridge. The ac-magnetic field superimposed on the earth's field was applied to the specimen. We observed nonzero values of χn for all n in the temperature range of the superconducting transition. The observed χn-T curves were analyzed by the Kim-Anderson critical-state model. We found that the pinning force density increases up to x = 0.5 and decreases over x = 0.5 with increasing the Ca content x, and is proportional to two kinds of the power of the elemental pinning force.

Original languageEnglish
Pages (from-to)324-328
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - 2002 Oct 1
Externally publishedYes

Keywords

  • Ca substitution
  • Harmonic susceptibilities
  • La-based cuprates
  • Pinning force

ASJC Scopus subject areas

  • Condensed Matter Physics

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