Growth and annealing effect of Co-doped BaFe2As2 single crystals

被引：14

作者：

Sun, D. L. ^{[1
,2
]}

Xiao, J. Z. ^{[3
]}

Lin, C. T. ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Hefei 230031, Peoples R China

[3] Univ Coimbra, Dept Phys, P-3004516 Coimbra, Portugal

来源：

JOURNAL OF CRYSTAL GROWTH | 2011年 / 321卷 / 01期

关键词：

Crystal structure; Growth from solutions; Superconducting materials; SUPERCONDUCTIVITY;

D O I：

10.1016/j.jcrysgro.2011.02.033

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

A series of Co-doped BaFe2-xCoxAs2 (0 <= x <= 0.32) single crystals have been grown by self-flux method. Study of X-ray diffraction indicates that the lattice parameter c of the crystals decrease linearly with the increase in Co-content added to the initial mixtures. The segregation coefficient of Co related to Fe is determined to be similar to 0.78. The values of superconducting transition temperature T-c are found to increase to about 1-3 K by post growth annealing at high temperature, which should result from the improved crystallinity due to the release of residual strain in the samples. In addition, we demonstrate that the annealing atmosphere of Ar, air or vacuum has an identical effect on the enhancement of T-c. Due to inhomogeneous Co distribution, a broad transition temperature width Delta T-c is observed and discussed for the over-doped samples. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：55 / 59

页数：5

共 23 条

[1] Superconductivity in LnFePO (Ln = La, Pr and Nd) single crystals [J].

Baumbach, R. E. ;

Hamlin, J. J. ;

Shu, L. ;

Zocco, D. A. ;

Crisosto, N. M. ;

Maple, M. B. .

NEW JOURNAL OF PHYSICS, 2009, 11

[2] High pressure studies on Fe-pnictide superconductors [J].

Chu, C. W. ;

Lorenz, B. .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2009, 469 (9-12) :385-395

[3] The synthesis and characterization of LiFeAs and NaFeAs [J].

Chu, C. W. ;

Chen, F. ;

Gooch, M. ;

Guloy, A. M. ;

Lorenz, B. ;

Lv, B. ;

Sasmal, K. ;

Tang, Z. J. ;

Tapp, J. H. ;

Xue, Y. Y. .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2009, 469 (9-12) :326-331

[4] Determination of the phase diagram of the electron-doped superconductor Ba(Fe1-xCox)2As2 [J].

Chu, Jiun-Haw ;

Analytis, James G. ;

Kucharczyk, Chris ;

Fisher, Ian R. .

PHYSICAL REVIEW B, 2009, 79 (01)

[5] Growth of NdFeAs(O1-xFx) single crystals at ambient pressure and their transport properties [J].

Fang, Lei ;

Cheng, Peng ;

Jia, Ying ;

Zhu, Xiyu ;

Luo, Huiqian ;

Mu, Gang ;

Gu, Changzhi ;

Wen, Hai-Hu .

JOURNAL OF CRYSTAL GROWTH, 2009, 311 (02) :358-361

[6] Superconductivity in the PbO-type structure α-FeSe [J].

Hsu, Fong-Chi ;

Luo, Jiu-Yong ;

Yeh, Kuo-Wei ;

Chen, Ta-Kun ;

Huang, Tzu-Wen ;

Wu, Phillip M. ;

Lee, Yong-Chi ;

Huang, Yi-Lin ;

Chu, Yan-Yi ;

Yan, Der-Chung ;

Wu, Maw-Kuen .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2008, 105 (38) :14262-14264

[7]

INOSOV DS, 2010, NATURE PHYS, V178, P181

[8] Rare earth magnetism in CeFeAsO: a single crystal study [J].

Jesche, A. ;

Krellner, C. ;

de Souza, M. ;

Lang, M. ;

Geibel, C. .

NEW JOURNAL OF PHYSICS, 2009, 11

[9] Iron-based layered superconductor La[O1-xFx]FeAs (x=0.05-0.12) with Tc=26 K [J].

Kamihara, Yoichi ;

Watanabe, Takumi ;

Hirano, Masahiro ;

Hosono, Hideo .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (11) :3296-+

[10] Evidence for multiple superconducting gaps in optimally doped BaFe1.87Co0.13As2 from infrared spectroscopy [J].

Kim, K. W. ;

Roessle, M. ;

Dubroka, A. ;

Malik, V. K. ;

Wolf, T. ;

Bernhard, C. .

PHYSICAL REVIEW B, 2010, 81 (21)

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