Doping states and irreversibility fields of high-pressure-synthesized (Tl,Cu)Sr2Ca2Cu3Oy superconductors

T. Shibata, T. Tatsuki, S. Adachi, K. Tanabe, S. Fujihara, T. Kimura

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8 Citations (Scopus)

Abstract

The effects of Cu substitution for Tl in TlSr2Ca2Cu3Oy superconductor were investigated. Nearly single-phase samples of Tl1-xCuxSr2Ca2Cu3 Oy (x = 0.2-0.6) were successfully synthesized using a high pressure technique. The observed shrinkage in the lattice parameter a, concave ρ-T curve above Tc and negative thermoelectric power near room temperature indicated that the Cu-substituted samples were over-doped. Tc for the sample with x = 0.4 increased from 73 to 94 K after annealing treatment in flowing argon gas. The Cu-substituted samples showed lower irreversibility field Birr as a function of reduced temperature than that of the pristine TlSr2Ca2Cu3Oy [Physica C 324 (1999) 15].

Original languageEnglish
Pages (from-to)200-206
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume353
Issue number3-4
DOIs
Publication statusPublished - 2001 May 15

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Keywords

  • Resistivity
  • Substitution irreversibility field
  • Thermoelectric power
  • Tl-1223
  • Tl-Sr-Ca-Cu-O

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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