Superconductivity at 2.2 K in the layered oxypnictide La3Ni 4P4O2

T. Klimczuk, T. M. McQueen, A. J. Williams, Q. Huang, F. Ronning, E. D. Bauer, J. D. Thompson, M. A. Green, R. J. Cava

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29 Scopus citations


We report the observation of superconductivity in La3Ni 4P4O2 at 2.2 K. The layer stacking in this compound results in an asymmetric distribution of charge reservoir layers around the Ni2P2 planes. The estimated Wilson ratio, R W≈5, indicates the presence of strongly enhanced normal-state susceptibility, but many of the basic superconducting characteristics are conventional. The estimated electronic contribution to the specific heat, γ≈6.2 mJ mol-Ni-1 K-2, is about 2/3 of that found in layered nickel borocarbide superconductors.

Original languageEnglish (US)
Article number012505
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
StatePublished - Jan 5 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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