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

doi:10.1103/PhysRevB.79.012505

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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Abstract

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 language	English (US)
Article number	012505
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.79.012505
State	Published - Jan 5 2009

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Superconductivity at 2.2 K in the layered oxypnictide La3Ni 4P4O2",

abstract = "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.",

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AU - Klimczuk, T.

AU - McQueen, T. M.

AU - Williams, A. J.

AU - Huang, Q.

AU - Ronning, F.

AU - Bauer, E. D.

AU - Thompson, J. D.

AU - Green, M. A.

AU - Cava, R. J.

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N2 - 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.

AB - 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.

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Superconductivity at 2.2 K in the layered oxypnictide La₃Ni ₄P₄O₂

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