Superconductivity above 130 K in the Hg-Pb-Ba-Ca-Cu-O system

Zafar Iqbal, T. Datta, D. Kirven, A. Lungu, J. C. Barry, F. J. Owens, A. G. Rinzler, D. Yang, F. Reidinger

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Abstract

High volume fractions of the n=2 and n=3 members of a cuprate system of general formula Hg1-xPbxBa2Can-1CunO2n-2+ (with an average value of x at 0.33) have been synthesized via a relatively facile process using low oxygen pressures. For as-synthesized n=3 (Hg,Pb-1:2:2:3) bulk superconducting critical temperatures (Tc) of up to 133 K have been observed. For n=2 (Hg,Pb-1:2:1:2), which is obtained with some rare-earth-ion substitution at the calcium site, Tc is 125 K after annealing in a reducing atmosphere. High-resolution lattice imaging coupled with structural simulations show that the Pb ions go into the Hg layer, leading to a chemical pressure-induced compositional modulation in this plane. Strong flux pinning and an irreversibility field of 1 T at 80 K are observed for Hg,Pb-1:2:2:3.

Original languageEnglish (US)
Pages (from-to)12322-12325
Number of pages4
JournalPhysical Review B
Volume49
Issue number17
DOIs
StatePublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Iqbal, Z., Datta, T., Kirven, D., Lungu, A., Barry, J. C., Owens, F. J., Rinzler, A. G., Yang, D., & Reidinger, F. (1994). Superconductivity above 130 K in the Hg-Pb-Ba-Ca-Cu-O system. Physical Review B, 49(17), 12322-12325. https://doi.org/10.1103/PhysRevB.49.12322