Superconductivity at 2.2 K in the layered oxypnictide La₃Ni₄P₄O₂

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T. Klimczuk,^1,2 T. M. McQueen,³ A. J. Williams,³ Q. Huang,⁴ F. Ronning,¹ E. D. Bauer,¹ J. D. Thompson,¹ M. A. Green,^4,5 and R. J. Cava³
¹Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
²Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-952 Gdansk, Poland
³Department of Chemistry, Princeton University, Princeton New Jersey 08544, USA
⁴NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg Maryland 20899, USA
⁵Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA

Received 7 November 2008; revised 2 December 2008; published 26 January 2009

Wereport the observation of superconductivity in La₃Ni₄P₄O₂ at 2.2 K.The layer stacking in this compound results in an asymmetricdistribution of charge reservoir layers around the Ni₂P₂ planes. Theestimated Wilson ratio, R_W [approximate] 5, indicates the presence of strongly enhancednormal-state susceptibility, but many of the basic superconducting characteristics areconventional. The estimated electronic contribution to the specific heat, gamma 6.2 mJ mol-Ni⁻¹ K⁻²,is about 2/3 of that found in layered nickel borocarbidesuperconductors.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.79.012505
DOI:	10.1103/PhysRevB.79.012505
PACS:	74.70.Dd; 74.62.Bf 74.70.Dd Superconducting ternary, quaternary and multinary compounds 74.62.Bf Effects of material synthesis, crystal structure, and chemical composition on superconducting transition temperature YEAR: 2009
KEYWORDS:	lanthanum compounds, magnetic susceptibility, nickel compounds, specific heat, superconducting materials, superconducting thin films

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