Superconductivity at 2.2 K in the layered oxypnictide La3Ni4P4O2

被引：35

作者：

Klimczuk, T. ^{[1
,2
]}

McQueen, T. M. ^{[3
]}

Williams, A. J. ^{[3
]}

Huang, Q. ^{[4
]}

Ronning, F. ^{[1
]}

Bauer, E. D. ^{[1
]}

Thompson, J. D. ^{[1
]}

Green, M. A. ^{[4
,5
]}

Cava, R. J. ^{[3
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Gdansk Univ Technol, Fac Appl Phys & Math, PL-80952 Gdansk, Poland

[3] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[4] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[5] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 01期

基金：

美国国家科学基金会;

关键词：

lanthanum compounds; magnetic susceptibility; nickel compounds; specific heat; superconducting materials; superconducting thin films; TEMPERATURE; DEPENDENCE; LIFEAS; SYSTEM;

D O I：

10.1103/PhysRevB.79.012505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the observation of superconductivity in La3Ni4P4O2 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 approximate to 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, gamma approximate to 6.2 mJ mol-Ni-1 K-2, is about 2/3 of that found in layered nickel borocarbide superconductors.

引用

页数：4

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