Synthesis and physical properties of LaO1-xFxFeAs

被引：43

作者：

Kondrat, A. ^{[1
]}

Hamann-Borrero, J. E. ^{[1
]}

Leps, N. ^{[1
]}

Kosmala, M. ^{[2
]}

Schumann, O. ^{[2
]}

Koehler, A. ^{[1
]}

Werner, J. ^{[1
]}

Behr, G. ^{[1
]}

Braden, M. ^{[2
]}

Klingeler, R. ^{[1
]}

Buechner, B. ^{[1
]}

Hess, C. ^{[1
]}

机构：

[1] IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany

[2] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

来源：

EUROPEAN PHYSICAL JOURNAL B | 2009年 / 70卷 / 04期

关键词：

LAYERED QUATERNARY COMPOUND; SUPERCONDUCTIVITY;

D O I：

10.1140/epjb/e2009-00267-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have prepared the newly discovered Fe-based superconducting material LaO1-xFxFeAs (0 <= x <= 0.2) in polycrystalline form and have investigated the samples by means of structural, thermodynamic and transport measurements. Our investigations reveal a non superconducting phase at 0 <= x less than or similar to 0.04 which for x = 0 is characterized by a structural transition towards an orthorhombic distortion at T-s approximate to 160 K and antiferromagnetic spin order at T-N approximate to 138 K. Both transitions lead to strong anomalies in various transport properties as well as in magnetization and in specific heat. Remarkably, the transition temperatures are only weakly doping dependent up to x approximate to 0.04. However, the transitions are abruptly suppressed at x >= 0.05 in favour of a superconducting phase with a critical temperature T-c greater than or similar to 20 K. Upon further increasing the F-doping T-c increases up to a maximum of T-c = 26.8 K at x = 0.1 which is followed by a decrease down to T-c approximate to 10 K at x >= 0.15.

引用

页码：461 / 468

页数：8

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