Superconductivity at 75 K in Hg-1222 cuprates: (Hg,M)Sr2(Ln,Ce)2Cu2Oz (M = Ti, V, Cr, Mo, W, Re; Ln = Sm-Er)

E. Kandyel; A. Yamamoto; S. Tajima

doi:10.1016/S0921-4534(00)00529-3

Superconductivity at 75 K in Hg-1222 cuprates: (Hg,M)Sr₂(Ln,Ce)₂Cu₂O_z (M = Ti, V, Cr, Mo, W, Re; Ln = Sm-Er)

E. Kandyel, A. Yamamoto, S. Tajima

Global course of Engineering and Science

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3 Citations (Scopus)

Abstract

We systematically synthesized (Hg,W)-1222 cuprates, (Hg,M)Sr₂(Ln,Ce)₂Cu₂O_z under 2 GPa at 1100°C. Single of nearly single-phase compounds are successfully obtained fix M = Ti, V, Cr, Mo, W and Re, and for Ln = Sm-Er. The structure of these compounds belongs to the same family of 1222 phase and is derived from that of (Hg,M)OSr₂(Ca,Ln)Cu₂O_z by replacing the single (Ca,Ln) layer with a double fluorite (Ln,Ce)₂O₂ layer. The (Hg_0.75W_0.25)Sr₂(Gd_1.5Ce _0.5)Cu₂O_z compound crystallizes in a tetragonal lattice with cell parameters a = 3.832, c = 29.150 Å. All synthesized samples, except for the compound with Cr, show bulk superconductivity with large Meissner volume fractions. T_c was found to increase with increasing valence of the cation M and with decreasing ionic radius of Ln. The maximum T_c of 75 K is obtained for (Hg_0.75W_0.25)Sr₂(Gd_1.5Ce _0.5)Cu₂O_z.

Original language	English
Pages (from-to)	429-432
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	341-348
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(00)00529-3
Publication status	Published - 2000 Jan 1

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ASJC Scopus subject areas

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

Cite this

Kandyel, E., Yamamoto, A., & Tajima, S. (2000). Superconductivity at 75 K in Hg-1222 cuprates: (Hg,M)Sr₂(Ln,Ce)₂Cu₂O_z (M = Ti, V, Cr, Mo, W, Re; Ln = Sm-Er). Physica C: Superconductivity and its applications, 341-348(PART 1), 429-432. https://doi.org/10.1016/S0921-4534(00)00529-3

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abstract = "We systematically synthesized (Hg,W)-1222 cuprates, (Hg,M)Sr2(Ln,Ce)2Cu2Oz under 2 GPa at 1100°C. Single of nearly single-phase compounds are successfully obtained fix M = Ti, V, Cr, Mo, W and Re, and for Ln = Sm-Er. The structure of these compounds belongs to the same family of 1222 phase and is derived from that of (Hg,M)OSr2(Ca,Ln)Cu2Oz by replacing the single (Ca,Ln) layer with a double fluorite (Ln,Ce)2O2 layer. The (Hg0.75W0.25)Sr2(Gd1.5Ce 0.5)Cu2Oz compound crystallizes in a tetragonal lattice with cell parameters a = 3.832, c = 29.150 {\AA}. All synthesized samples, except for the compound with Cr, show bulk superconductivity with large Meissner volume fractions. Tc was found to increase with increasing valence of the cation M and with decreasing ionic radius of Ln. The maximum Tc of 75 K is obtained for (Hg0.75W0.25)Sr2(Gd1.5Ce 0.5)Cu2Oz.",

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T2 - (Hg,M)Sr2(Ln,Ce)2Cu2Oz (M = Ti, V, Cr, Mo, W, Re; Ln = Sm-Er)

AU - Kandyel, E.

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N2 - We systematically synthesized (Hg,W)-1222 cuprates, (Hg,M)Sr2(Ln,Ce)2Cu2Oz under 2 GPa at 1100°C. Single of nearly single-phase compounds are successfully obtained fix M = Ti, V, Cr, Mo, W and Re, and for Ln = Sm-Er. The structure of these compounds belongs to the same family of 1222 phase and is derived from that of (Hg,M)OSr2(Ca,Ln)Cu2Oz by replacing the single (Ca,Ln) layer with a double fluorite (Ln,Ce)2O2 layer. The (Hg0.75W0.25)Sr2(Gd1.5Ce 0.5)Cu2Oz compound crystallizes in a tetragonal lattice with cell parameters a = 3.832, c = 29.150 Å. All synthesized samples, except for the compound with Cr, show bulk superconductivity with large Meissner volume fractions. Tc was found to increase with increasing valence of the cation M and with decreasing ionic radius of Ln. The maximum Tc of 75 K is obtained for (Hg0.75W0.25)Sr2(Gd1.5Ce 0.5)Cu2Oz.

AB - We systematically synthesized (Hg,W)-1222 cuprates, (Hg,M)Sr2(Ln,Ce)2Cu2Oz under 2 GPa at 1100°C. Single of nearly single-phase compounds are successfully obtained fix M = Ti, V, Cr, Mo, W and Re, and for Ln = Sm-Er. The structure of these compounds belongs to the same family of 1222 phase and is derived from that of (Hg,M)OSr2(Ca,Ln)Cu2Oz by replacing the single (Ca,Ln) layer with a double fluorite (Ln,Ce)2O2 layer. The (Hg0.75W0.25)Sr2(Gd1.5Ce 0.5)Cu2Oz compound crystallizes in a tetragonal lattice with cell parameters a = 3.832, c = 29.150 Å. All synthesized samples, except for the compound with Cr, show bulk superconductivity with large Meissner volume fractions. Tc was found to increase with increasing valence of the cation M and with decreasing ionic radius of Ln. The maximum Tc of 75 K is obtained for (Hg0.75W0.25)Sr2(Gd1.5Ce 0.5)Cu2Oz.

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10.1016/S0921-4534(00)00529-3