Vortex phase transition and isotropic flux dynamics in K0.8Fe2Se2 single crystal lightly doped with Mn

被引：21

作者：

Ge, Junyi ^{[1
]}

Gutierrez, Joffre ^{[1
]}

Li, Mingtao ^{[2
]}

Zhang, Jincang ^{[2
]}

Moshchalkov, Victor V. ^{[1
]}

机构：

[1] Katholieke Univ Leuven, INPAC Inst Nanoscale Phys & Chem, B-3001 Heverlee, Belgium

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

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 05期

基金：

中国国家自然科学基金;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTORS; AC SUSCEPTIBILITY MEASUREMENTS; IRREVERSIBILITY; MAGNETIZATION; RESISTIVITY; CREEP;

D O I：

10.1063/1.4816959

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have applied ac susceptibility measurements to study the vortex dynamics in a high quality K0.79Fe1.86Mn0.01Se2 single crystal with applied magnetic field both parallel and perpendicular to the c-axis. The irreversibility line has been determined in the frequency range of 133 Hz-9777Hz which can be well fitted using H-irr = H-0(1 - T/T-c)(beta) with beta = 1.49 for H parallel to c and beta = 1.63 for H parallel to ab. The field dependence of the activation energy U-0 is derived in the framework of thermally activated flux creep theory, yielding a power law dependence similar to H-n with n approximate to -0.58 for H below 0.75 T and n approximate to -1 for H above 0.75 T. The derived activation energy U-0 shows nearly isotropic behavior for both field directions and high values reaching 10(5) K at low fields. This observation points towards very strong intrinsic pinning in the investigated material, thus making KFeSe-systems promising for technical applications. (C) 2013 AIP Publishing LLC.

引用

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