Effect of Re substitution on the formation and fluctuation-induced conductivity of a Tl Sr2(Ca1-xRex)Cu 2O7-δ (x=0.05-0.30) superconductor

Annas Al-Sharabi, Roslan Abd. Shukor

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Samples with the nominal starting compositions of TlSr2(Ca 1-xRex)Cu2O7-δ (x=0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) were prepared using a solid state reaction. The samples were studied using powder X-ray diffraction, energy dispersive X-ray analysis and electrical resistance measurements. An excess conductivity analysis was carried out using the Aslamazov-Larkin (AL) theory, and the dimension of fluctuation induced conductivity (λ) was determined. The Lawrence-Donaich (LD) theory was used to calculate the coherence length (ξc(0)), Josephson coupling (J), and γ=(ξab(0)/ξc(0)) of the superconductive samples. Substituting the Re in TlSr2(Ca 1-xRex)Cu2O7-δ (Tl-1212) caused an initial increase in the zero-resistance-temperature (T c zero). The sample where x=0.20 showed the highest T c onset and Tc zero. The XRD patterns indicated that this sample was only Tl-1212 phase. The excess conductivity analyses showed that Re substitution induced 2D-to-3D conductivity transitions at the highest transition temperature (T2D-3D) observed at x=0.15. The calculations based on the Lawrence-Doniach model revealed that the shortest coherence length and inter-plane coupling (J) occurred when x=0.30. Re in the Tl-1212 phase is in a mixed valence state (4+/5+) with an optimal value of 4.5+.

Original languageEnglish
Pages (from-to)9383-9388
Number of pages6
JournalCeramics International
Volume40
Issue number7 PART A
DOIs
Publication statusPublished - 2014

Fingerprint

Superconducting materials
Substitution reactions
Acoustic impedance
Energy dispersive X ray analysis
Solid state reactions
X ray powder diffraction
Superconducting transition temperature
Chemical analysis
Temperature

Keywords

  • Aslamazov-Larkin theory
  • Lawrence-Donaich theory
  • Re substitution
  • Tl-1212 phase

ASJC Scopus subject areas

  • Ceramics and Composites
  • Process Chemistry and Technology
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Effect of Re substitution on the formation and fluctuation-induced conductivity of a Tl Sr2(Ca1-xRex)Cu 2O7-δ (x=0.05-0.30) superconductor. / Al-Sharabi, Annas; Abd. Shukor, Roslan.

In: Ceramics International, Vol. 40, No. 7 PART A, 2014, p. 9383-9388.

Research output: Contribution to journalArticle

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