Study of vortex dynamics in single crystalline Ba0.54K0.46Fe2As2 superconductor using dc and ac magnetization

JOURNAL OF ALLOYS AND COMPOUNDS

卷:686

Article

Paladhi, D.¹  Zhang, C.^2,3  Tan, Guotai⁴  Dai, P.²  Nath, T. K.¹ 

[1] Indian Inst Technol Kharagpur, Dept Phys, Kharagpur 721302, W Bengal, India

[2] Rice Univ, Dept Phys & Astron, MS 61, 6100 Main St, Houston, TX 77005 USA

[3] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Sch Phys, Wuhan 430074, Peoples R China

[4] Beijing Normal Univ, Beijing 100875, Peoples R China

关键词: Irreversibility line;    Vortex-glass;    Ac-susceptibility;    Pnictides;    Single crystal;   

DOI  :  10.1016/j.jallcom.2016.06.202

来源: Elsevier

【 摘 要 】

Due to relatively lower superconducting transition temperature(T-c), weaker anisotropy and larger coherence length, the overall strength of thermal fluctuations in iron-based superconductors seem to be intermediate between cuprates and more classical superconductors like Nb3Sn. A detailed linear and non-linear ac magnetic susceptibility technique has been used as a probe to investigate the vortex-glass melting transition and vortex dynamics in an optimally doped p-type Ba0.54K0.46Fe2As2 good quality single crystal (RRR approximate to 10) under various fields and frequency range. Besides these, we have also constructed a vortex phase diagram in this compound using dc magnetization. Magnetic irreversibility temperature (T-irr) is the only temperature where solid vortex phase shows true zero resistance and has a great importance for technical applications of a superconductor. We have clearly observed that Tirr strongly depends on frequency and this dependency can be explained in the framework of vortex-glass phase transition model. From our experimental observations, we conclude that vortex-glass melting transition is second order in nature and vortex phase shows glassy character in this compound. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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