Superconductivity in high-T c (Tl 1− x Se x )Sr 2 CaCu 2 O 7 system

J. Nur-Akasyah, Roslan Abd. Shukor

Research output: Contribution to journalArticle

Abstract

Superconductivity up to 76 K has been achieved in Se substituted Tl-1212 phase, (Tl 1− x Se x )Sr 2 CaCu 2 O 7 . X-ray diffraction patterns showed the presence of Tl-1212 as the major phase in most samples. The highest volume fraction of Tl-1212 phase (88%)was observed in the x = 0.1 sample. The electrical resistance measurement showed the highest onset temperature, T c−onset (76 K)for x = 0.2 and 0.4. AC susceptibility (χ = χ + iχ″)measurements showed the highest superconducting transition temperature T cχ′ = 71 K for x = 0.4. The peak temperature, T p of the imaginary part of the susceptibility, χ″ was also the highest for x = 0.4 sample (T p = 69 K). The inter-grain critical current density at the peak temperature, J c (T p )for all samples was between 17 and 19 A cm −2 . This work showed that in addition to Bi, Pb, Cr, V, Re and rare-earth elements, Se substitution for Tl also resulted in the formation of a superconducting material in the TlSr 2 CaCu 2 O 7−δ phase.

Original languageEnglish
Pages (from-to)109-113
Number of pages5
JournalCryogenics
Volume100
DOIs
Publication statusPublished - 1 Jun 2019

Fingerprint

Superconductivity
superconductivity
Acoustic impedance
Rare earth elements
magnetic permeability
Temperature
Diffraction patterns
Superconducting materials
Superconducting transition temperature
Volume fraction
Substitution reactions
electrical resistance
X ray diffraction
critical current
alternating current
diffraction patterns
rare earth elements
transition temperature
substitutes
current density

Keywords

  • Inter-grain critical current density
  • Se substitution
  • Superconducting transition

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Superconductivity in high-T c (Tl 1− x Se x )Sr 2 CaCu 2 O 7 system . / Nur-Akasyah, J.; Abd. Shukor, Roslan.

In: Cryogenics, Vol. 100, 01.06.2019, p. 109-113.

Research output: Contribution to journalArticle

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AB - Superconductivity up to 76 K has been achieved in Se substituted Tl-1212 phase, (Tl 1− x Se x )Sr 2 CaCu 2 O 7 . X-ray diffraction patterns showed the presence of Tl-1212 as the major phase in most samples. The highest volume fraction of Tl-1212 phase (88%)was observed in the x = 0.1 sample. The electrical resistance measurement showed the highest onset temperature, T c−onset (76 K)for x = 0.2 and 0.4. AC susceptibility (χ = χ + iχ″)measurements showed the highest superconducting transition temperature T cχ′ = 71 K for x = 0.4. The peak temperature, T p of the imaginary part of the susceptibility, χ″ was also the highest for x = 0.4 sample (T p = 69 K). The inter-grain critical current density at the peak temperature, J c (T p )for all samples was between 17 and 19 A cm −2 . This work showed that in addition to Bi, Pb, Cr, V, Re and rare-earth elements, Se substitution for Tl also resulted in the formation of a superconducting material in the TlSr 2 CaCu 2 O 7−δ phase.

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