Three-dimensional superconductivity in nominal composition Fe1.03Se with Tczero up to 10.9 K induced by internal strain

被引：21

作者：

Ge, Junyi ^{[1
]}

Cao, Shixun ^{[1
]}

Yuan, Shujuan ^{[1
]}

Kang, Baojuan ^{[1
]}

Zhang, Jincang ^{[1
]}

机构：

[1] Shanghai Univ, Dept Phys, Shanghai 200444, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2010年 / 108卷 / 05期

基金：

中国国家自然科学基金;

关键词：

MAGNETIC PHASE-DIAGRAM; CRITICAL FLUCTUATION; ORDER-PARAMETER; RESISTANCE;

D O I：

10.1063/1.3481096

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Iron selenide with the nominal composition Fe1.03Se was synthesized by a self-flux solution method which shows a zero resistance temperature up to 10.9 K and a T-c(onset) (90% rho(n), rho(n): normal state resistivity) up to 13.3 K. The residual resistivity ratio RRR=R(300 K)/R-0=12. Scanning electron microscopy-EDX study shows that the composition of as grown sample is near stoichiometric FeSe. The decrease in superconducting transition temperature by heat treatment indicates that internal crystallographic strain which plays the same effect as external pressure is the origin of its high T-c. The fluctuation conductivity was studied which could be well described by three-dimensional (3D) Aslamazov-Larkin power law. The estimated value of coherence length xi(c)=9.2 angstrom is larger than the distance between conducting layers (similar to 6.0 angstrom), indicating the 3D nature of superconductivity in this compound. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3481096]

引用

页数：5

共 37 条

[1] INFLUENCE OF FLUCTUATION PAIRING OF ELECTRONS ON CONDUCTIVITY OF NORMAL METAL [J].

ASLAMAZO.LG ;

LARKIN, AI .

PHYSICS LETTERS A, 1968, A 26 (06) :238-&

[2] Superconducting and normal phases of FeSe single crystals at high pressure [J].

Braithwaite, D. ;

Salce, B. ;

Lapertot, G. ;

Bourdarot, F. ;

Marin, C. ;

Aoki, D. ;

Hanfland, M. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2009, 21 (23)

[3] SUPERCONDUCTIVE FLUCTUATIONS IN THE DENSITY OF STATES AND TUNNELING RESISTANCE IN HIGH-TC SUPERCONDUCTORS [J].

DICASTRO, C ;

RAIMONDI, R ;

CASTELLANI, C ;

VARLAMOV, AA .

PHYSICAL REVIEW B, 1990, 42 (16) :10211-10219

[4]

DOIRONLEYRAUD N, ARXIV09050964

[5] Theory of fluctuation conductivity from interband pairing in pnictide superconductors [J].

Fanfarillo, L. ;

Benfatto, L. ;

Caprara, S. ;

Castellani, C. ;

Grilli, M. .

PHYSICAL REVIEW B, 2009, 79 (17)

[6] Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82 [J].

Fang, M. H. ;

Pham, H. M. ;

Qian, B. ;

Liu, T. J. ;

Vehstedt, E. K. ;

Liu, Y. ;

Spinu, L. ;

Mao, Z. Q. .

PHYSICAL REVIEW B, 2008, 78 (22)

[7] 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

[8] Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields [J].

Hunte, F. ;

Jaroszynski, J. ;

Gurevich, A. ;

Larbalestier, D. C. ;

Jin, R. ;

Sefat, A. S. ;

McGuire, M. A. ;

Sales, B. C. ;

Christen, D. K. ;

Mandrus, D. .

NATURE, 2008, 453 (7197) :903-905

[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]

KARKIN AE, ARXIV09111194

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