Excess conductivity analysis of Cr substituted TlSr2CaCu 2O7-δ superconductor at Tl and Ca sites

Annas Al-Sharabi, Roslan Abd. Shukor

Research output: Contribution to journalArticle

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Abstract

Samples with nominal starting compositions (Tl1- xCrx)Sr2CaCu2O7 and TlSr2(Ca1 -xCrx)Cu2O7 (x = 0.05-0.30) had been prepared by the solid state reaction method and studied by powder X-ray diffraction method, electrical resistance measurements and energy dispersive X-ray analysis (EDX). Cr 2S3 was used as the Cr source. Excess conductivity analysis using the Aslamazov-Larkin (AL) theory to determine the dimension of fluctuation induced conductivity λ was carried out. 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 superconducting samples. Partial substitution of Cr in place of Tl in (Tl1-xCrx)Sr2CaCu 2O7-δ (Tl-1212) showed initial increase in zero-resistance-temperature, Tc zero. Sample with x = 0.15 showed the highest superconducting onset temperature Tc onset (105 K) and the lowest normal state electrical resistivity. XRD patterns indicated that the samples were dominantly Tl-1212 phase. Excess conductivity analyses showed that Cr substitution induced 2D-to-3D conductivity transition with the highest transition temperature, T2D -3D observed at x = 0.15. The calculations based on Lawrence-Doniach model revealed shortest coherence length, ξc(0) and lowest interplanar coupling, J for x = 0.20. Substitution of Cr in place of Ca in TlSr2(Ca1-xCr x)Cu2O7-δ showed Tc onset between 90 K (x = 0.3) and 104 K (x = 0.2). Excess conductivity analyses for TlSr2(Ca1- xCrx)Cu2O7- δ showed 2D-to-3D transition of fluctuation induced conductivity and the highest T2D-3D was for x = 0.2. The maximum value of ξc(0) and J was also for x = 0.2. This work showed strong relation between Tc onset and T 2D-3D.

Original languageEnglish
Pages (from-to)363-371
Number of pages9
JournalJournal of Alloys and Compounds
Volume615
DOIs
Publication statusPublished - 5 Dec 2014

Fingerprint

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

Keywords

  • Electrical transport
  • Solid state reaction
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Excess conductivity analysis of Cr substituted TlSr2CaCu 2O7-δ superconductor at Tl and Ca sites. / Al-Sharabi, Annas; Abd. Shukor, Roslan.

In: Journal of Alloys and Compounds, Vol. 615, 05.12.2014, p. 363-371.

Research output: Contribution to journalArticle

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abstract = "Samples with nominal starting compositions (Tl1- xCrx)Sr2CaCu2O7 -δ and TlSr2(Ca1 -xCrx)Cu2O7 -δ (x = 0.05-0.30) had been prepared by the solid state reaction method and studied by powder X-ray diffraction method, electrical resistance measurements and energy dispersive X-ray analysis (EDX). Cr 2S3 was used as the Cr source. Excess conductivity analysis using the Aslamazov-Larkin (AL) theory to determine the dimension of fluctuation induced conductivity λ was carried out. 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 superconducting samples. Partial substitution of Cr in place of Tl in (Tl1-xCrx)Sr2CaCu 2O7-δ (Tl-1212) showed initial increase in zero-resistance-temperature, Tc zero. Sample with x = 0.15 showed the highest superconducting onset temperature Tc onset (105 K) and the lowest normal state electrical resistivity. XRD patterns indicated that the samples were dominantly Tl-1212 phase. Excess conductivity analyses showed that Cr substitution induced 2D-to-3D conductivity transition with the highest transition temperature, T2D -3D observed at x = 0.15. The calculations based on Lawrence-Doniach model revealed shortest coherence length, ξc(0) and lowest interplanar coupling, J for x = 0.20. Substitution of Cr in place of Ca in TlSr2(Ca1-xCr x)Cu2O7-δ showed Tc onset between 90 K (x = 0.3) and 104 K (x = 0.2). Excess conductivity analyses for TlSr2(Ca1- xCrx)Cu2O7- δ showed 2D-to-3D transition of fluctuation induced conductivity and the highest T2D-3D was for x = 0.2. The maximum value of ξc(0) and J was also for x = 0.2. This work showed strong relation between Tc onset and T 2D-3D.",
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N2 - Samples with nominal starting compositions (Tl1- xCrx)Sr2CaCu2O7 -δ and TlSr2(Ca1 -xCrx)Cu2O7 -δ (x = 0.05-0.30) had been prepared by the solid state reaction method and studied by powder X-ray diffraction method, electrical resistance measurements and energy dispersive X-ray analysis (EDX). Cr 2S3 was used as the Cr source. Excess conductivity analysis using the Aslamazov-Larkin (AL) theory to determine the dimension of fluctuation induced conductivity λ was carried out. 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 superconducting samples. Partial substitution of Cr in place of Tl in (Tl1-xCrx)Sr2CaCu 2O7-δ (Tl-1212) showed initial increase in zero-resistance-temperature, Tc zero. Sample with x = 0.15 showed the highest superconducting onset temperature Tc onset (105 K) and the lowest normal state electrical resistivity. XRD patterns indicated that the samples were dominantly Tl-1212 phase. Excess conductivity analyses showed that Cr substitution induced 2D-to-3D conductivity transition with the highest transition temperature, T2D -3D observed at x = 0.15. The calculations based on Lawrence-Doniach model revealed shortest coherence length, ξc(0) and lowest interplanar coupling, J for x = 0.20. Substitution of Cr in place of Ca in TlSr2(Ca1-xCr x)Cu2O7-δ showed Tc onset between 90 K (x = 0.3) and 104 K (x = 0.2). Excess conductivity analyses for TlSr2(Ca1- xCrx)Cu2O7- δ showed 2D-to-3D transition of fluctuation induced conductivity and the highest T2D-3D was for x = 0.2. The maximum value of ξc(0) and J was also for x = 0.2. This work showed strong relation between Tc onset and T 2D-3D.

AB - Samples with nominal starting compositions (Tl1- xCrx)Sr2CaCu2O7 -δ and TlSr2(Ca1 -xCrx)Cu2O7 -δ (x = 0.05-0.30) had been prepared by the solid state reaction method and studied by powder X-ray diffraction method, electrical resistance measurements and energy dispersive X-ray analysis (EDX). Cr 2S3 was used as the Cr source. Excess conductivity analysis using the Aslamazov-Larkin (AL) theory to determine the dimension of fluctuation induced conductivity λ was carried out. 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 superconducting samples. Partial substitution of Cr in place of Tl in (Tl1-xCrx)Sr2CaCu 2O7-δ (Tl-1212) showed initial increase in zero-resistance-temperature, Tc zero. Sample with x = 0.15 showed the highest superconducting onset temperature Tc onset (105 K) and the lowest normal state electrical resistivity. XRD patterns indicated that the samples were dominantly Tl-1212 phase. Excess conductivity analyses showed that Cr substitution induced 2D-to-3D conductivity transition with the highest transition temperature, T2D -3D observed at x = 0.15. The calculations based on Lawrence-Doniach model revealed shortest coherence length, ξc(0) and lowest interplanar coupling, J for x = 0.20. Substitution of Cr in place of Ca in TlSr2(Ca1-xCr x)Cu2O7-δ showed Tc onset between 90 K (x = 0.3) and 104 K (x = 0.2). Excess conductivity analyses for TlSr2(Ca1- xCrx)Cu2O7- δ showed 2D-to-3D transition of fluctuation induced conductivity and the highest T2D-3D was for x = 0.2. The maximum value of ξc(0) and J was also for x = 0.2. This work showed strong relation between Tc onset and T 2D-3D.

KW - Electrical transport

KW - Solid state reaction

KW - X-ray diffraction

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