Effects of rare-earth elements and alkali metals on the superconductivity of (Tl0.7M0.3)Sr2Ca0.8Cr0.2Cu2O7 with M = Gd, Er, La, Li, Na, K, and Rb

Ilhamsyah Putra Abu Bakar, Roslan Abd. Shukor

Research output: Contribution to journalArticle

Abstract

The effects of rare-earth elements M = Gd, Er, and La and alkali metals M = K, Li, Na, and Rb substitutions on Tl0.7M0.3Sr2Ca0.8Cr0.2Cu2O7 (Tl-1212) were investigated. The characterization includes X-ray diffraction method, scanning electron microscopy, electrical resistance and AC susceptibility measurements. X-ray diffraction patterns showed that almost all samples consisted of major Tl-1212 and minor Tl-1201 and Ca0.3Sr0.7CuO2 phase. Rare-earth elemental substitution improved the formation of the Tl-1212 phase but suppressed the transition temperature. Scanning electron micrographs showed smaller grain size in the substituted samples compared with non-substituted sample. The temperature-dependent electrical resistance measurements showed metallic normal state behavior for all samples. Alkali metals substitutions showed higher zero transition temperature, Tc-zero compared with the rare-earth elemental substitution. AC susceptibility measurements showed a higher superconducting transition, Tcχ′ for alkali metals substitutions (84–93 K) compared with the rare-earth elemental substitutions (50–61 K). The inter-grain critical current density at the peak temperature Tp of the imaginary part χ” Jc(Tp) measured using the Bean's model was between 17 and 22 A cm−2. The effects of rare-earth elements and alkali metals substitutions were discussed in terms of ionic radius and the concept of average Cu valence.

LanguageEnglish
Pages745-750
Number of pages6
JournalJournal of Alloys and Compounds
Volume772
DOIs
Publication statusPublished - 25 Jan 2019

Fingerprint

Alkali Metals
Alkali metals
Superconductivity
Rare earth elements
Substitution reactions
Rare earths
Acoustic impedance
Superconducting transition temperature
X ray diffraction
Diffraction patterns
Scanning
Temperature
Scanning electron microscopy
Electrons

Keywords

  • AC susceptibility
  • Critical current density
  • Microstructure
  • Tl-1212 phase

ASJC Scopus subject areas

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

Cite this

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title = "Effects of rare-earth elements and alkali metals on the superconductivity of (Tl0.7M0.3)Sr2Ca0.8Cr0.2Cu2O7 with M = Gd, Er, La, Li, Na, K, and Rb",
abstract = "The effects of rare-earth elements M = Gd, Er, and La and alkali metals M = K, Li, Na, and Rb substitutions on Tl0.7M0.3Sr2Ca0.8Cr0.2Cu2O7 (Tl-1212) were investigated. The characterization includes X-ray diffraction method, scanning electron microscopy, electrical resistance and AC susceptibility measurements. X-ray diffraction patterns showed that almost all samples consisted of major Tl-1212 and minor Tl-1201 and Ca0.3Sr0.7CuO2 phase. Rare-earth elemental substitution improved the formation of the Tl-1212 phase but suppressed the transition temperature. Scanning electron micrographs showed smaller grain size in the substituted samples compared with non-substituted sample. The temperature-dependent electrical resistance measurements showed metallic normal state behavior for all samples. Alkali metals substitutions showed higher zero transition temperature, Tc-zero compared with the rare-earth elemental substitution. AC susceptibility measurements showed a higher superconducting transition, Tcχ′ for alkali metals substitutions (84–93 K) compared with the rare-earth elemental substitutions (50–61 K). The inter-grain critical current density at the peak temperature Tp of the imaginary part χ” Jc(Tp) measured using the Bean's model was between 17 and 22 A cm−2. The effects of rare-earth elements and alkali metals substitutions were discussed in terms of ionic radius and the concept of average Cu valence.",
keywords = "AC susceptibility, Critical current density, Microstructure, Tl-1212 phase",
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T1 - Effects of rare-earth elements and alkali metals on the superconductivity of (Tl0.7M0.3)Sr2Ca0.8Cr0.2Cu2O7 with M = Gd, Er, La, Li, Na, K, and Rb

AU - Abu Bakar, Ilhamsyah Putra

AU - Abd. Shukor, Roslan

PY - 2019/1/25

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N2 - The effects of rare-earth elements M = Gd, Er, and La and alkali metals M = K, Li, Na, and Rb substitutions on Tl0.7M0.3Sr2Ca0.8Cr0.2Cu2O7 (Tl-1212) were investigated. The characterization includes X-ray diffraction method, scanning electron microscopy, electrical resistance and AC susceptibility measurements. X-ray diffraction patterns showed that almost all samples consisted of major Tl-1212 and minor Tl-1201 and Ca0.3Sr0.7CuO2 phase. Rare-earth elemental substitution improved the formation of the Tl-1212 phase but suppressed the transition temperature. Scanning electron micrographs showed smaller grain size in the substituted samples compared with non-substituted sample. The temperature-dependent electrical resistance measurements showed metallic normal state behavior for all samples. Alkali metals substitutions showed higher zero transition temperature, Tc-zero compared with the rare-earth elemental substitution. AC susceptibility measurements showed a higher superconducting transition, Tcχ′ for alkali metals substitutions (84–93 K) compared with the rare-earth elemental substitutions (50–61 K). The inter-grain critical current density at the peak temperature Tp of the imaginary part χ” Jc(Tp) measured using the Bean's model was between 17 and 22 A cm−2. The effects of rare-earth elements and alkali metals substitutions were discussed in terms of ionic radius and the concept of average Cu valence.

AB - The effects of rare-earth elements M = Gd, Er, and La and alkali metals M = K, Li, Na, and Rb substitutions on Tl0.7M0.3Sr2Ca0.8Cr0.2Cu2O7 (Tl-1212) were investigated. The characterization includes X-ray diffraction method, scanning electron microscopy, electrical resistance and AC susceptibility measurements. X-ray diffraction patterns showed that almost all samples consisted of major Tl-1212 and minor Tl-1201 and Ca0.3Sr0.7CuO2 phase. Rare-earth elemental substitution improved the formation of the Tl-1212 phase but suppressed the transition temperature. Scanning electron micrographs showed smaller grain size in the substituted samples compared with non-substituted sample. The temperature-dependent electrical resistance measurements showed metallic normal state behavior for all samples. Alkali metals substitutions showed higher zero transition temperature, Tc-zero compared with the rare-earth elemental substitution. AC susceptibility measurements showed a higher superconducting transition, Tcχ′ for alkali metals substitutions (84–93 K) compared with the rare-earth elemental substitutions (50–61 K). The inter-grain critical current density at the peak temperature Tp of the imaginary part χ” Jc(Tp) measured using the Bean's model was between 17 and 22 A cm−2. The effects of rare-earth elements and alkali metals substitutions were discussed in terms of ionic radius and the concept of average Cu valence.

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