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Influence of Connectivity on Vortex-Dynamic Properties of Polycrystalline NdFeAsO0.88F0.12 Superconductors

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Abstract

Polycrystalline NdFeAsO0.88F0.12 samples were prepared by both high pressure (HP) and ambient pressure (AP) methods. Magnetic hysteresis loops (MHLs) as well as magnetic relaxation were measured to investigate the vortex dynamic properties of the two samples. Magnetic relaxation rate S combined with effective pinning barrier energies U eff were calculated as a function of temperature and magnetic field. The results suggest that: (1) The samples with different connectivity display different properties of MHLs, indicating the coexistence of bulk superconductivity and granularity; (2) The different S(T) behaviors between sample AP and sample HP result from the transition from globality to granularity; (3) Field dependent S shows that the pinning mechanism of NdFeAsO0.88F0.12 can not be explained by collective pinning theory; (4) The anomalous temperature and magnetic field dependence of effective barrier energies as well as magnetic relaxation rate may be evoked by the competition between Bean-Livingstone (BL) surface pinning and bulk pinning.

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Acknowledgements

We are very grateful to thank Professors Haihu Wen and Yanwei Ma for their help. This work was supported by the Natural Science Foundation, the Ministry of Science and Technology of China (973 project: No. 2011CBA00105), Jiangsu Science and Technology Support Project (Grant No. BE2011027), Scientific Research Foundation of Graduate School (Grant No. YBJJ1104) of Southeast University, and Scientific Innovation Research Foundation of College Graduate in Jiangsu Province (CXZZ_0135).

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Authors and Affiliations

  1. Key Laboratory of MEMS of the Ministry of Education, Department of Physics, Southeast University, Nanjing, 211189, People’s Republic of China

    J. C. Zhuang, Y. Sun, Y. Ding, F. F. Yuan, X. Jia & Z. X. Shi

  2. Nanjing Jin Ling High School, Nanjing, 211189, People’s Republic of China

    H. Y. Huang

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  1. J. C. Zhuang
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  2. Y. Sun
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  3. Y. Ding
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  4. F. F. Yuan
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Correspondence to Z. X. Shi.

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Zhuang, J.C., Sun, Y., Ding, Y. et al. Influence of Connectivity on Vortex-Dynamic Properties of Polycrystalline NdFeAsO0.88F0.12 Superconductors. J Low Temp Phys 172, 113–121 (2013). https://doi.org/10.1007/s10909-012-0846-6

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