Effect of annealing on the superconducting properties of Bi1.7Pb0.3Sr2Ca1-xSmxCu2Oy (0.0 ≤ x ≤ 1.0) system

S. Satyavathi, Muralidhar Miryala, K. Nandakishore, V. Hari Babu, O. Pena, M. Sergent, F. Beniere

Research output: Contribution to journalArticle

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Abstract

Detailed studies on the superconducting properties of Bi1.7Pb0.3Sr2Ca1-xSmxCu2Oy (0.0 ≤ x ≤ 1.0) system have been done employing X-ray diffraction, electrical resistance, a.c. susceptibility, and d.c. magnetization techniques. XRD data has shown that the a-parameter increases while the c-parameter decreases gradually with increasing Sm concentration (x). Superconducting onsets from a.c. susceptibility measurements have increased with x up to 0.06 and men decreased with Sm content. Magnetization measurements indicated a decrease in superconducting volume ( dM dH) with x. The results have shown that substitution of Ca2+ by Sm3+ probably brings about changes in the hole carrier concentration, which in turn alters Tc and the volume fraction of the superconducting phase. Vacuum annealing has shown to improve the onsets of Tc although subsequent air annealing has lowered them. The results are explained on the basis of changes in the oxygen content and the average oxidation state of Cu. We have thus shown that the substitution of Sm3+ for Ca2+ with specific combinations of annealing conditions leads to the optimization of the oxidation state of Cu and, in turn, of Tc.

Original languageEnglish
Pages (from-to)187-195
Number of pages9
JournalApplied Superconductivity
Volume3
Issue number4
DOIs
Publication statusPublished - 1995
Externally publishedYes

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Annealing
annealing
Magnetization
Substitution reactions
substitutes
magnetic permeability
Oxidation
magnetization
oxidation
Acoustic impedance
electrical resistance
Carrier concentration
Volume fraction
Vacuum
X ray diffraction
vacuum
optimization
Oxygen
air
oxygen

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Effect of annealing on the superconducting properties of Bi1.7Pb0.3Sr2Ca1-xSmxCu2Oy (0.0 ≤ x ≤ 1.0) system. / Satyavathi, S.; Miryala, Muralidhar; Nandakishore, K.; Babu, V. Hari; Pena, O.; Sergent, M.; Beniere, F.

In: Applied Superconductivity, Vol. 3, No. 4, 1995, p. 187-195.

Research output: Contribution to journalArticle

Satyavathi, S. ; Miryala, Muralidhar ; Nandakishore, K. ; Babu, V. Hari ; Pena, O. ; Sergent, M. ; Beniere, F. / Effect of annealing on the superconducting properties of Bi1.7Pb0.3Sr2Ca1-xSmxCu2Oy (0.0 ≤ x ≤ 1.0) system. In: Applied Superconductivity. 1995 ; Vol. 3, No. 4. pp. 187-195.
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AU - Sergent, M.

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