An enhancement of Tc, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr2(Ca, Y)Cu2O7-δ

R. S. Liu; D. Groult; A. Maignan; S. F. Hu; D. A. Jefferson; B. Raveau; C. Michel; M. Hervieu; P. P. Edwards

doi:10.1016/0921-4534(92)90070-S

An enhancement of T_c, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr₂(Ca, Y)Cu₂O_7-δ

R. S. Liu^*
, D. Groult
, A. Maignan
, S. F. Hu
, D. A. Jefferson
, B. Raveau
, C. Michel
, M. Hervieu
, P. P. Edwards

^*Corresponding author for this work

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

53 Citations (Scopus)

Abstract

An enhancement in the superconducting transition temperature, T_c, from 45 K to 70 K, has been discovered during the course of our investigation of Cd-doping of the Pb-based 1212 superconductors. Specifically, we have attempted to synthesize a material with nominal composition (Pb_0.5Cd_0.5)Sr₂(Ca_0.5Y_0.5)Cu₂O_7-δ, derived from the lead cuprate superconductor (Pb_0.7Cu_0.3)Sr₂(Ca_0.5Y_0.5)Cu₂O_7-δ. From X-ray and electron diffraction, coupled with energy-dispersive X-ray emission spectrometry, we can identify the phase responsible for the 70 K superconductivity to be (Pb_0.67(2)Cd_0.33(5))Sr_2.1(1)(Cd_0.20(3)Ca_0.33(3)Y_0.48(4))Cu₂O_7-δ. Thus, we propose substitution of Cd both for Cu, in the rock salt-type (Pb, Cu)O layers, and Ca, in the Ca_0.5Y_0.5 lattice sites. No superlattice spots or streaks were observed in the electron diffraction experiments along the a^*, b^* and c^* directions in the Cd-substituted material.

Original language	English
Pages (from-to)	35-40
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	195
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(92)90070-S
Publication status	Published - 1992 May 20
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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10.1016/0921-4534(92)90070-S

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title = "An enhancement of Tc, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr2(Ca, Y)Cu2O7-δ",

abstract = "An enhancement in the superconducting transition temperature, Tc, from 45 K to 70 K, has been discovered during the course of our investigation of Cd-doping of the Pb-based 1212 superconductors. Specifically, we have attempted to synthesize a material with nominal composition (Pb0.5Cd0.5)Sr2(Ca0.5Y0.5)Cu2O7-δ, derived from the lead cuprate superconductor (Pb0.7Cu0.3)Sr2(Ca0.5Y0.5)Cu2O7-δ. From X-ray and electron diffraction, coupled with energy-dispersive X-ray emission spectrometry, we can identify the phase responsible for the 70 K superconductivity to be (Pb0.67(2)Cd0.33(5))Sr2.1(1)(Cd0.20(3)Ca0.33(3)Y0.48(4))Cu2O7-δ. Thus, we propose substitution of Cd both for Cu, in the rock salt-type (Pb, Cu)O layers, and Ca, in the Ca0.5Y0.5 lattice sites. No superlattice spots or streaks were observed in the electron diffraction experiments along the a*, b* and c* directions in the Cd-substituted material.",

author = "Liu, \{R. S.\} and D. Groult and A. Maignan and Hu, \{S. F.\} and Jefferson, \{D. A.\} and B. Raveau and C. Michel and M. Hervieu and Edwards, \{P. P.\}",

note = "Funding Information: We thank the BICC plc., the Fellowship of Engineering,B P, JEOL (UK) and SERC for support. One of us (SFH) thanks the financial support from the",

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doi = "10.1016/0921-4534(92)90070-S",

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T1 - An enhancement of Tc, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr2(Ca, Y)Cu2O7-δ

AU - Liu, R. S.

AU - Groult, D.

AU - Maignan, A.

AU - Hu, S. F.

AU - Jefferson, D. A.

AU - Raveau, B.

AU - Michel, C.

AU - Hervieu, M.

AU - Edwards, P. P.

N1 - Funding Information: We thank the BICC plc., the Fellowship of Engineering,B P, JEOL (UK) and SERC for support. One of us (SFH) thanks the financial support from the

PY - 1992/5/20

Y1 - 1992/5/20

N2 - An enhancement in the superconducting transition temperature, Tc, from 45 K to 70 K, has been discovered during the course of our investigation of Cd-doping of the Pb-based 1212 superconductors. Specifically, we have attempted to synthesize a material with nominal composition (Pb0.5Cd0.5)Sr2(Ca0.5Y0.5)Cu2O7-δ, derived from the lead cuprate superconductor (Pb0.7Cu0.3)Sr2(Ca0.5Y0.5)Cu2O7-δ. From X-ray and electron diffraction, coupled with energy-dispersive X-ray emission spectrometry, we can identify the phase responsible for the 70 K superconductivity to be (Pb0.67(2)Cd0.33(5))Sr2.1(1)(Cd0.20(3)Ca0.33(3)Y0.48(4))Cu2O7-δ. Thus, we propose substitution of Cd both for Cu, in the rock salt-type (Pb, Cu)O layers, and Ca, in the Ca0.5Y0.5 lattice sites. No superlattice spots or streaks were observed in the electron diffraction experiments along the a*, b* and c* directions in the Cd-substituted material.

AB - An enhancement in the superconducting transition temperature, Tc, from 45 K to 70 K, has been discovered during the course of our investigation of Cd-doping of the Pb-based 1212 superconductors. Specifically, we have attempted to synthesize a material with nominal composition (Pb0.5Cd0.5)Sr2(Ca0.5Y0.5)Cu2O7-δ, derived from the lead cuprate superconductor (Pb0.7Cu0.3)Sr2(Ca0.5Y0.5)Cu2O7-δ. From X-ray and electron diffraction, coupled with energy-dispersive X-ray emission spectrometry, we can identify the phase responsible for the 70 K superconductivity to be (Pb0.67(2)Cd0.33(5))Sr2.1(1)(Cd0.20(3)Ca0.33(3)Y0.48(4))Cu2O7-δ. Thus, we propose substitution of Cd both for Cu, in the rock salt-type (Pb, Cu)O layers, and Ca, in the Ca0.5Y0.5 lattice sites. No superlattice spots or streaks were observed in the electron diffraction experiments along the a*, b* and c* directions in the Cd-substituted material.

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An enhancement of T_c, from 45 K to 70 K, via Cd substitution in (Pb, Cu)Sr₂(Ca, Y)Cu₂O_7-δ

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