Superconductivity at 90 K in the Tl-Ba-Cu-O System

Z. Sheng, A. Hermann, A. Ali, C. Almasan, J. Estrada, T. Datta, R. Matson

Research output: Contribution to journalArticlepeer-review


Stable and reproducible superconductivity has been unambiguously observed in a new Tl-Ba-Cu-O system containing no group-IIIB elements. Resistance in these rare-earth-free oxides starts to drop sharply above 90 K and reaches zero at 81 K. Meissner flux expulsion and diamagnetic shielding show bulk superconductivity. Further substitutions of elements for this system may lead to even higher-temperature superconductors.
Original languageAmerican English
Pages (from-to)937-940
Number of pages4
JournalPhysical Review Letters
Issue number10
StatePublished - 1988

NREL Publication Number

  • NREL/JA-5200-72010


  • resistance
  • superconductivity


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