Annealing study on (Hg,Tl) 2Ba2Can-1CunOy (n = 1-5) superconductors

T. Tatsuki, Ayako Yamamoto, T. Tamura, S. Adachi, K. Tanabe

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We have investigated the effects of post-annealing on the Tc of (Hg,Tl)-22(n - 1)n (n =1-5) superconductors synthesized under high pressure. Reducing treatments in Ar, 3% H2/Ar or 5% H2/N2 were found to be effective in increasing the Tc of the n = 2-5 compounds, in particular for the (Hg,Tl)-2212 and (Hg,Tl)-2223 phases. Such enhancement in Tc is considered to be caused by the optimization of the hole concentrations in these compounds. The highest Tc of 120 K in this series was recorded for the n = 3 phase after post-annealing in 5% H2/N2. Though the 2201 sample did not show superconductivity even after the reducing treatments, superconductivity below 36 K was observed by substituting 40 % Nd for Ba. It is considered that our as-synthesized samples with n = 1-3 and n = 4, 5 are highly overdoped and slightly overdoped, respectively.

Original languageEnglish
Pages (from-to)160-168
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Volume278
Issue number3-4
Publication statusPublished - 1997 May 1
Externally publishedYes

Fingerprint

Superconductivity
Superconducting materials
superconductivity
Annealing
Hole concentration
annealing
optimization
augmentation

Keywords

  • Hg-Tl-Ba-Ca-Cu-O
  • High pressure synthesis
  • Homologous series
  • Post annealing
  • Superconductivity

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Annealing study on (Hg,Tl) 2Ba2Can-1CunOy (n = 1-5) superconductors. / Tatsuki, T.; Yamamoto, Ayako; Tamura, T.; Adachi, S.; Tanabe, K.

In: Physica C: Superconductivity and its Applications, Vol. 278, No. 3-4, 01.05.1997, p. 160-168.

Research output: Contribution to journalArticle

Tatsuki, T, Yamamoto, A, Tamura, T, Adachi, S & Tanabe, K 1997, 'Annealing study on (Hg,Tl) 2Ba2Can-1CunOy (n = 1-5) superconductors', Physica C: Superconductivity and its Applications, vol. 278, no. 3-4, pp. 160-168.
Tatsuki, T. ; Yamamoto, Ayako ; Tamura, T. ; Adachi, S. ; Tanabe, K. / Annealing study on (Hg,Tl) 2Ba2Can-1CunOy (n = 1-5) superconductors. In: Physica C: Superconductivity and its Applications. 1997 ; Vol. 278, No. 3-4. pp. 160-168.
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