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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)429-432
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume341-348
Issue numberPART 1
DOIs
Publication statusPublished - 2000 Jan 1

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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