New high Tc superconductor: (In,Pb,Cu)Sr2(Ca,Y) Cu2O7-δ

R. S. Liu; Shu-Fen Hu; P. P. Edwards

doi:10.1063/1.106322

New high T_c superconductor: (In,Pb,Cu)Sr₂(Ca,Y) Cu₂O_7-δ

R. S. Liu, Shu-Fen Hu, P. P. Edwards

Department of Physics

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

10 Citations (Scopus)

Abstract

Bulk superconductivity was observed in the new system (In _xPb_0.75-xCu_0.25)Sr₂(Ca _0.5Y_0.5)Cu₂ O_7-δ. An increase in indium doping, 0≤x≤0.2, into the Pb sites results in an increase in the superconducting transition temperature T_c from 45 K for x=0 to 60 K for x=0.2. For nominal compositions x≳0.2, a decrease in T_c was observed, and an increase in the concentration of an impurity phase. From the results of the x-ray diffraction and energy- dispersive spectrometry, we identify the phase responsible for the superconductivity to be [In _0.06(1)Pb_0.69(1)Cu_0.25]Sr _1.99(7)[Ca_0.47(1)Y _0.53(2)]Cu₂O _7-δ; this phase resulted from the synthesis of a sample of nominal composition (In_0.2Pb_0.55Cu_0.25)Sr ₂(Ca_0.5Y_0.5)Cu₂ O _7-δ.

Original language	English
Pages (from-to)	985-987
Number of pages	3
Journal	Applied Physics Letters
Volume	59
Issue number	8
DOIs	https://doi.org/10.1063/1.106322
Publication status	Published - 1991

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "New high Tc superconductor: (In,Pb,Cu)Sr2(Ca,Y) Cu2O7-δ",

abstract = "Bulk superconductivity was observed in the new system (In xPb0.75-xCu0.25)Sr2(Ca 0.5Y0.5)Cu2 O7-δ. An increase in indium doping, 0≤x≤0.2, into the Pb sites results in an increase in the superconducting transition temperature Tc from 45 K for x=0 to 60 K for x=0.2. For nominal compositions x≳0.2, a decrease in Tc was observed, and an increase in the concentration of an impurity phase. From the results of the x-ray diffraction and energy- dispersive spectrometry, we identify the phase responsible for the superconductivity to be [In 0.06(1)Pb0.69(1)Cu0.25]Sr 1.99(7)[Ca0.47(1)Y 0.53(2)]Cu2O 7-δ; this phase resulted from the synthesis of a sample of nominal composition (In0.2Pb0.55Cu0.25)Sr 2(Ca0.5Y0.5)Cu2 O 7-δ.",

author = "Liu, {R. S.} and Shu-Fen Hu and Edwards, {P. P.}",

year = "1991",

doi = "10.1063/1.106322",

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pages = "985--987",

journal = "Applied Physics Letters",

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T1 - New high Tc superconductor

T2 - (In,Pb,Cu)Sr2(Ca,Y) Cu2O7-δ

AU - Liu, R. S.

AU - Hu, Shu-Fen

AU - Edwards, P. P.

PY - 1991

Y1 - 1991

N2 - Bulk superconductivity was observed in the new system (In xPb0.75-xCu0.25)Sr2(Ca 0.5Y0.5)Cu2 O7-δ. An increase in indium doping, 0≤x≤0.2, into the Pb sites results in an increase in the superconducting transition temperature Tc from 45 K for x=0 to 60 K for x=0.2. For nominal compositions x≳0.2, a decrease in Tc was observed, and an increase in the concentration of an impurity phase. From the results of the x-ray diffraction and energy- dispersive spectrometry, we identify the phase responsible for the superconductivity to be [In 0.06(1)Pb0.69(1)Cu0.25]Sr 1.99(7)[Ca0.47(1)Y 0.53(2)]Cu2O 7-δ; this phase resulted from the synthesis of a sample of nominal composition (In0.2Pb0.55Cu0.25)Sr 2(Ca0.5Y0.5)Cu2 O 7-δ.

AB - Bulk superconductivity was observed in the new system (In xPb0.75-xCu0.25)Sr2(Ca 0.5Y0.5)Cu2 O7-δ. An increase in indium doping, 0≤x≤0.2, into the Pb sites results in an increase in the superconducting transition temperature Tc from 45 K for x=0 to 60 K for x=0.2. For nominal compositions x≳0.2, a decrease in Tc was observed, and an increase in the concentration of an impurity phase. From the results of the x-ray diffraction and energy- dispersive spectrometry, we identify the phase responsible for the superconductivity to be [In 0.06(1)Pb0.69(1)Cu0.25]Sr 1.99(7)[Ca0.47(1)Y 0.53(2)]Cu2O 7-δ; this phase resulted from the synthesis of a sample of nominal composition (In0.2Pb0.55Cu0.25)Sr 2(Ca0.5Y0.5)Cu2 O 7-δ.

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