Phase formation and transition temperature variation of TlSr 2(Ca 1-x R x )Cu 2O 7 (R∈=∈Dy, Ho and Tb) superconductor

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6 Citations (Scopus)

Abstract

The TlSr 2(Ca 1-x R x )Cu 2O 7 (Tl-1212) phase with R∈=∈Dy, Tb and Ho for x=0.1-0.6 has been studied by powder x-ray diffraction method and electrical resistance measurement. All the samples showed a metallic normal state behavior. No correlation between ionic radius and T c∈onset is observed. The three series show the highest volume fraction (>97%) of Tl-1212 phase for x=0.5. The highest T c∈onset does not correspond to the highest volume fraction. The above results are explained as due to the mixed valence state of Dy and Tb in the Tl-1212 phase.

Original languageEnglish
Pages (from-to)705-709
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Volume22
Issue number7
DOIs
Publication statusPublished - Oct 2009

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Superconducting materials
Superconducting transition temperature
Volume fraction
transition temperature
Acoustic impedance
electrical resistance
Powders
x ray diffraction
Diffraction
valence
X rays
radii
temperature

Keywords

  • Electrical resistance
  • Tl-1212 superconductor
  • Transition temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Phase formation and transition temperature variation of TlSr 2(Ca 1-x R x )Cu 2O 7 (R∈=∈Dy, Ho and Tb) superconductor",
abstract = "The TlSr 2(Ca 1-x R x )Cu 2O 7 (Tl-1212) phase with R∈=∈Dy, Tb and Ho for x=0.1-0.6 has been studied by powder x-ray diffraction method and electrical resistance measurement. All the samples showed a metallic normal state behavior. No correlation between ionic radius and T c∈onset is observed. The three series show the highest volume fraction (>97{\%}) of Tl-1212 phase for x=0.5. The highest T c∈onset does not correspond to the highest volume fraction. The above results are explained as due to the mixed valence state of Dy and Tb in the Tl-1212 phase.",
keywords = "Electrical resistance, Tl-1212 superconductor, Transition temperature",
author = "Yip, {W. Y.} and {Abd. Shukor}, Roslan",
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AU - Yip, W. Y.

AU - Abd. Shukor, Roslan

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N2 - The TlSr 2(Ca 1-x R x )Cu 2O 7 (Tl-1212) phase with R∈=∈Dy, Tb and Ho for x=0.1-0.6 has been studied by powder x-ray diffraction method and electrical resistance measurement. All the samples showed a metallic normal state behavior. No correlation between ionic radius and T c∈onset is observed. The three series show the highest volume fraction (>97%) of Tl-1212 phase for x=0.5. The highest T c∈onset does not correspond to the highest volume fraction. The above results are explained as due to the mixed valence state of Dy and Tb in the Tl-1212 phase.

AB - The TlSr 2(Ca 1-x R x )Cu 2O 7 (Tl-1212) phase with R∈=∈Dy, Tb and Ho for x=0.1-0.6 has been studied by powder x-ray diffraction method and electrical resistance measurement. All the samples showed a metallic normal state behavior. No correlation between ionic radius and T c∈onset is observed. The three series show the highest volume fraction (>97%) of Tl-1212 phase for x=0.5. The highest T c∈onset does not correspond to the highest volume fraction. The above results are explained as due to the mixed valence state of Dy and Tb in the Tl-1212 phase.

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