Superconductor with Tc up to 8 K in the compound (Ln,Ca)(Sr,Ba)2(C,Cu)Cu2O7-δ

Tohru Den, Tamaki Kobayashi, Jun Akimitsu

Research output: Contribution to journalArticle

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Abstract

We have synthesized a new family of oxycarbonate compounds (Ln,Ca) (Sr,Ba)2(C,Cu)Cu2O7-δ (Ln: rare-earth metals) with a so-called "CO3-1212" structure. Two kinds of single phase in the general formula Er0.5Ca0.5Sr2-xBaxCu3-y CyO7-δ with (x,y)=(0.6, 0.5) and (1.3, 0.4) were prepared at different CO2 partial pressures. The former compound shows a superconducting transition at about 45 K, and the latter has Tc up to 80 K. This rise in Tc may come from the increase of carrier density because of the decrease of carbon content. We have also studied the Ln-dependence, and it is revealed that most of the compounds Ln0.5Ca0.5Sr0.7Ba1.3Cu2.6C0.4O7-δ show the same results, except for Ln=Ce and Tb, which did not construct the structure, and also Ln=Pr, which shows suppressed superconductivity with Tc of 30 K.

Original languageEnglish
Pages (from-to)351-355
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume208
Issue number3-4
DOIs
Publication statusPublished - Apr 10 1993
Externally publishedYes

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Rare Earth Metals
Superconductivity
Partial pressure
Rare earths
Superconducting materials
Carrier concentration
partial pressure
rare earth elements
Carbon
superconductivity
carbon
Metals
metals

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Superconductor with Tc up to 8 K in the compound (Ln,Ca)(Sr,Ba)2(C,Cu)Cu2O7-δ . / Den, Tohru; Kobayashi, Tamaki; Akimitsu, Jun.

In: Physica C: Superconductivity and its Applications, Vol. 208, No. 3-4, 10.04.1993, p. 351-355.

Research output: Contribution to journalArticle

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