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Vortex Flux Dynamics and Harmonic ac Magnetic Response of Ba(Fe0.94 Ni0.06)2As2 Bulk Superconductor

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An Erratum to this article was published on 01 October 2016

Abstract

Vortex dynamics and nonlinear ac response are studied in a Ba(Fe0.94 Ni0.06)2As2(T c = 18.5 K) bulk superconductor in magnetic fields up to 12 T via ac susceptibility measurements of the first ten harmonics. A comprehensive study of the ac magnetic susceptibility and its first ten harmonics finds shifts to higher temperatures with increasing ac measurement frequencies (10 to 10,000 Hz) for a wide range of ac (1, 5, and 10 Oe) and dc fields (0 to 12 T). The characteristic measurement time constant t 1 is extracted from the exponential fit of the data and linked to vortex relaxation. The Anderson-Kim Arrhenius law is applied to determine flux activation energy E a /k as a function dc magnetic field. The de-pinning, or irreversibility lines, were determined by a variety of methods and extensively mapped. The ac response shows surprisingly weak higher harmonic components, suggesting weak nonlinear behavior. Our data does not support the Fisher model; we do not see an abrupt vortex glass to vortex liquid transition and the resistivity does not drop to zero, although it appears to approach zero exponentially.

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Acknowledgments

This work was supported by NSF DMR-1006584 and DMR-1306785. The NHMFL facility is supported by the National Science Foundation under DMR-1157490, the State of Florida, and the U.S. Department of Energy.

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Authors and Affiliations

  1. Department of Physics, Saint Louis University, St. Louis, MO, 63103, USA

    Martin Nikolo

  2. National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Vivien S. Zapf & John Singleton

  3. Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA

    Jianyi Jiang, Jeremy D. Weiss & Eric E. Hellstrom

Authors
  1. Martin Nikolo
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  2. Vivien S. Zapf
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  3. John Singleton
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  4. Jianyi Jiang
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  5. Jeremy D. Weiss
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  6. Eric E. Hellstrom
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Corresponding author

Correspondence to Martin Nikolo.

Additional information

An erratum to this article can be found at http://dx.doi.org/10.1007/s10948-016-3821-7.

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Nikolo, M., Zapf, V.S., Singleton, J. et al. Vortex Flux Dynamics and Harmonic ac Magnetic Response of Ba(Fe0.94 Ni0.06)2As2 Bulk Superconductor. J Supercond Nov Magn 29, 2745–2752 (2016). https://doi.org/10.1007/s10948-016-3618-8

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  • DOI: https://doi.org/10.1007/s10948-016-3618-8

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