Superconductivity up to 90 K in a New Family of the (Pb,Hg)Sr2(Ca,Y)Cu2O7 System

S. F. Hu; D. A. Jefferson; R. S. Liu; P. P. Edwards

doi:10.1006/jssc.1993.1101

Superconductivity up to 90 K in a New Family of the (Pb,Hg)Sr₂(Ca,Y)Cu₂O₇ System

S. F. Hu^*, D. A. Jefferson, R. S. Liu, P. P. Edwards

^*Corresponding author for this work

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

87 Citations (Scopus)

Abstract

A new family of superconductors were observed in the (Pb_0.5Hg_0.5)Sr₂(Ca_1-xY_x)Cu₂O_7-δ system for the composition range 0.5 ≤ x ≤ 0.2, with a maximum T_c of 90 K (at x = 0.3) as determined by electrical resistance and magnetization measurements. We have investigated the crystal structure across the entire composition range by X-ray diffraction, by which we identify the phase responsible for the superconductivity to be similar to that of (Pb,Cu)Sr₂CaCu₂O₇ (the so-called Pb-based 1212 phase) with a space group of P4/mmm and lattice constants of a ranging from 3.8159(6) Å for x = 0.5 to 3.8082(4) Å for x = 0.2, and c ranging from 11.950(2) Å for x = 0.5 to 12.022(2) Å for x = 0.2. Moreover, the chemical composition of one sample in the series having nominal composition (Pb_0.5Hg_0.5)Sr₂(Ca_0.5Y_{0 .5})Cu₂O_7-δ(x = 0.5) was determined to be [Pb_0.6Hg_0.2Cu_0.2]Sr_2.0[Ca _0.42Y_0.51Hg_0.07] Cu₂O_{7- δ} by energy-dispersive spectrometry.

Original language	English
Pages (from-to)	280-286
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	103
Issue number	1
DOIs	https://doi.org/10.1006/jssc.1993.1101
Publication status	Published - 1993 Mar
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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@article{415466282c76486fa613d02e7d67c109,

title = "Superconductivity up to 90 K in a New Family of the (Pb,Hg)Sr2(Ca,Y)Cu2O7 System",

abstract = "A new family of superconductors were observed in the (Pb0.5Hg0.5)Sr2(Ca1-xYx )Cu2O7-δ system for the composition range 0.5 ≤ x ≤ 0.2, with a maximum Tc of 90 K (at x = 0.3) as determined by electrical resistance and magnetization measurements. We have investigated the crystal structure across the entire composition range by X-ray diffraction, by which we identify the phase responsible for the superconductivity to be similar to that of (Pb,Cu)Sr2CaCu2O7 (the so-called Pb-based 1212 phase) with a space group of P4/mmm and lattice constants of a ranging from 3.8159(6) {\AA} for x = 0.5 to 3.8082(4) {\AA} for x = 0.2, and c ranging from 11.950(2) {\AA} for x = 0.5 to 12.022(2) {\AA} for x = 0.2. Moreover, the chemical composition of one sample in the series having nominal composition (Pb0.5Hg0.5)Sr2(Ca0.5Y0 .5)Cu2O7-δ(x = 0.5) was determined to be [Pb0.6Hg0.2Cu0.2]Sr2.0[Ca 0.42Y0.51Hg0.07] Cu2O7- δ by energy-dispersive spectrometry.",

author = "Hu, {S. F.} and Jefferson, {D. A.} and Liu, {R. S.} and Edwards, {P. P.}",

year = "1993",

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T1 - Superconductivity up to 90 K in a New Family of the (Pb,Hg)Sr2(Ca,Y)Cu2O7 System

AU - Hu, S. F.

AU - Jefferson, D. A.

AU - Liu, R. S.

AU - Edwards, P. P.

PY - 1993/3

Y1 - 1993/3

N2 - A new family of superconductors were observed in the (Pb0.5Hg0.5)Sr2(Ca1-xYx )Cu2O7-δ system for the composition range 0.5 ≤ x ≤ 0.2, with a maximum Tc of 90 K (at x = 0.3) as determined by electrical resistance and magnetization measurements. We have investigated the crystal structure across the entire composition range by X-ray diffraction, by which we identify the phase responsible for the superconductivity to be similar to that of (Pb,Cu)Sr2CaCu2O7 (the so-called Pb-based 1212 phase) with a space group of P4/mmm and lattice constants of a ranging from 3.8159(6) Å for x = 0.5 to 3.8082(4) Å for x = 0.2, and c ranging from 11.950(2) Å for x = 0.5 to 12.022(2) Å for x = 0.2. Moreover, the chemical composition of one sample in the series having nominal composition (Pb0.5Hg0.5)Sr2(Ca0.5Y0 .5)Cu2O7-δ(x = 0.5) was determined to be [Pb0.6Hg0.2Cu0.2]Sr2.0[Ca 0.42Y0.51Hg0.07] Cu2O7- δ by energy-dispersive spectrometry.

AB - A new family of superconductors were observed in the (Pb0.5Hg0.5)Sr2(Ca1-xYx )Cu2O7-δ system for the composition range 0.5 ≤ x ≤ 0.2, with a maximum Tc of 90 K (at x = 0.3) as determined by electrical resistance and magnetization measurements. We have investigated the crystal structure across the entire composition range by X-ray diffraction, by which we identify the phase responsible for the superconductivity to be similar to that of (Pb,Cu)Sr2CaCu2O7 (the so-called Pb-based 1212 phase) with a space group of P4/mmm and lattice constants of a ranging from 3.8159(6) Å for x = 0.5 to 3.8082(4) Å for x = 0.2, and c ranging from 11.950(2) Å for x = 0.5 to 12.022(2) Å for x = 0.2. Moreover, the chemical composition of one sample in the series having nominal composition (Pb0.5Hg0.5)Sr2(Ca0.5Y0 .5)Cu2O7-δ(x = 0.5) was determined to be [Pb0.6Hg0.2Cu0.2]Sr2.0[Ca 0.42Y0.51Hg0.07] Cu2O7- δ by energy-dispersive spectrometry.

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Superconductivity up to 90 K in a New Family of the (Pb,Hg)Sr₂(Ca,Y)Cu₂O₇ System

Abstract

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