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

doi:10.1016/0921-4534(93)90208-8

Superconductor with T_c up to 8 K in the compound (Ln,Ca)(Sr,Ba)₂(C,Cu)Cu₂O_7-δ

Tohru Den, Tamaki Kobayashi, Jun Akimitsu

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

We have synthesized a new family of oxycarbonate compounds (Ln,Ca) (Sr,Ba)₂(C,Cu)Cu₂O_7-δ (Ln: rare-earth metals) with a so-called "CO₃-1212" structure. Two kinds of single phase in the general formula Er_0.5Ca_0.5Sr_2-xBa_xCu_3-y C_yO_7-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 T_c up to 80 K. This rise in T_c 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 Ln_0.5Ca_0.5Sr_0.7Ba_1.3Cu_2.6C_0.4O_7-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 T_c of 30 K.

Original language	English
Pages (from-to)	351-355
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	208
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(93)90208-8
Publication status	Published - Apr 10 1993
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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

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.",

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T1 - Superconductor with Tc up to 8 K in the compound (Ln,Ca)(Sr,Ba)2(C,Cu)Cu2O7-δ

AU - Den, Tohru

AU - Kobayashi, Tamaki

AU - Akimitsu, Jun

PY - 1993/4/10

Y1 - 1993/4/10

N2 - 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.

AB - 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.

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Superconductor with T_c up to 8 K in the compound (Ln,Ca)(Sr,Ba)₂(C,Cu)Cu₂O_7-δ

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